TXS75ZY-R1V,PDF,TXS75ZY-R1V PDF资料,Datasheet,下载TXS75ZY-R1V技术资料

Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Features

•

High density design in an industry standard

¾ brick size (2.4” x 3.45” x 0.5”)

Highly efficient topology with synchronous

rectifiers (η up to 92 %)

•

Unique mechanical and thermal design

Very high reliability achieved through

generous design safety margins

•

Tightly regulated output voltage, very low

output ripple, excellent dynamic performance

Monotonic start up

Provides basic insulation. I/O electric strength

test voltage 1500 V DC

Output voltage trim range ± 10 %

Remote sense, Primary remote ON/OFF

Overload, over temperature protection

Approvals cULus, TÜV, CE for LVD

•

Options / Accessories

Applications

•

Latest generation of broadband telecom

•

Negative ON/OFF logic

Long pins

and datacom equipment

•

High end computers

Wide trim range -30 %, +10 %

Horizontal heat sink

Vertical heat sink

Fibre optic network equipment

Gate array and RAM bank applications

Description

The TXS is a series of 75 to 120 A, open frame, highly efficient, board mountable DC-DC converters with a

unique patented thermal and mechanical design. These low voltage – high amperage converters supply the

next generation of microprocessors, gate arrays and integrated circuits with reliable power. The TXS series

features input under voltage lockout, overload and over temperature protection and fulfills all requirements

for a perfect fit into Distributed Power Architectures (DPAs).

Table of contents

Data section, tables

-

Output over voltage protection

Connection in parallel or in series

Output over current protection

Low input voltage

15

16

17

-

Selection chart, absolute max ratings

Approvals, safety, fusing

2

3

Electrical specification

3-5

5-6

6

EMC, reliability, environmental spec.

List of available application notes

Over temperature protection

Implementation

Characteristic curves

-

Safety considerations

EMC specification

18-19

20-22

22

-

Efficiency and power loss

Static and dynamic regulation

Turn on, turn off

7-8

9

Stability, input impedance

On board input and output filters

Thermal considerations

Reliability

10

11

12

22

Input and output ripple

23-25

25

Inrush current and MTBF figures

Description of functions

Layout considerations

Screw fixing

26

-

Trim function

13-14

14-15

15

26

Remote sense

Mechanical drawings

Ordering information

27

Loss and efficiency measurements

27

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Selection Chart

Model

Input voltage

range

Output

voltage

[V]

Output rated

current,

[A]

Rated power

[W]

Required airflow

[LFM] ^{1 / 2}

[V]

TXS75ZY

TXS75ZA

TXS75ZB

TXS80ZC

TXS80ZD

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZC

TXS100ZD

TXS120ZY

TXS120ZA

TXS120ZB

1.2

1.5

1.8

2.0

2.5

1.2

1.5

1.8

2.0

2.5

1.2

1.5

1.8

90

110

160

75

80

112

135

160

200

120

150

180

200

250

144

180

216

210

250

300

250

36-75

290

100

120

350

380

500

400 ³

450 ³

500 ³

¹LFM = Linear Feet per Minute (200 LFM ≈ 1 m/s)

²Conditions: T_A= 60 °C, T_{Base plate}= 100 °C, U_{i nom}±25 %, linear airflow, stand alone module.

Æ See pages 23 to 25 and calculation tool on TXS product CD ROM.

³Preliminary data

Options / Accessories

Suffix

Remarks

see Control Specifications table 3

Negative Logic

N

Unit enabled when control signal is low

Long Pin, Lengths: 0.24’’ (6.1 mm)

P2

Standard pin length: 0.18” (4.6 mm)

Standard trim range: 90 to 110 % U_{o nom}

Wide Trim Range: 70 to 110 % U_{o nom}

R

(see pages 13/14)

Horizontal Heat sink

0.24" (6.1 mm)

1H

2H

3H

1V

2V

3V

(Includes thermal pad)

To extend operating thermal range

0.45" (11.4 mm)

0.95" (24.1 mm)

0.24" (6.1 mm

Fins on horizontal heat sinks run from the

input pins toward the output pins. Fins on

vertical heat sinks 90 ° to this.

Vertical Heat sink

(Includes thermal pad)

0.45" (11.4 mm)

0.95" (24.1 mm)

Absolute Maximum Ratings

Stress in excess of the absolute maximum ratings may cause performance degradation, adversely affect

long term reliability or cause permanent damage to the converter.

Parameter

Maximum Input voltage (U_i)

Conditions/Description

Min

Max

Units

V DC

°C

Continuous

36

75

Transient, 100 ms

Full load

Non operational

One minute max.

TTL compatible, referenced to V_i(-)

Adjusted by trim and/or sense

100

115

1500

5.5

Operating Base Plate Temperature (T_BP

Storage Temperature (T_S)

)

-40

-55

°C

I/O Electric Strength Test Voltage

V DC

% U_{o nom}

ON/OFF Control Voltage (U_SD

)

-1.0

Maximum Output Voltage (U_o)

120

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Safety Specification and Approvals

Approvals

Parameter

Conditions/Description

Value

EN 60950:2000, UL 60950

CSA 22.2 No. 60950-00

UL/TÜV Approvals

UL file N^oE132494

Safety

Parameter

Conditions/Description

I/Case, I/O

Value

Basic ¹

Isolation

1

O/Case

Functional

I/Case, I/O

1500 V DC

500 V DC

typ. 50 MΩ

typ. 1.6 nF

Electric Strength Test Voltage ²

O/Case

Insulation Resistance

I/O Capacitance

EN 60950:2000/UL 60950

T_A= 25 °C

1

2

100 % factory test, one second

Fusing Considerations:

This power module is not internally fused. To meet safety requirements, an input line fuse should always be

used! Select a fuse according the specified input current in Table 1. The fuse rating should be selected in the

range [1.3·I_{i max}..10 A]. The UL file calls for a fuse rated F, 125 V DC, 10 A max. Refer to the fuse

manufacturer’s data for further information.

Electrical Specification

Unless otherwise stated the specification applies over the entire input voltage, output load and temperature

ranges. Sense lines are connected directly to the power pins. Trim pin is left open.

Table 1: Input Specification

Parameter

Conditions/Description

Min

36

Nom

48

Max

75

Units

Input Voltage

U_i

A

Max. Input Current

2.9

3.55

4.2

TXS75ZY

TXS75ZA

TXS75ZB

TXS80ZC

TXS80ZD

A

5.0

6.2

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZC

TXS100ZD

3.9

4.85

5.7

I_{i max}

U_{i min}, I_{o max,}T_BP= 100 °C

6.4

7.8

1

TXS120ZY

4.8

6.0

6.9

1

A

TXS120ZA

1

TXS120ZB

Inrush Current: All Types

I_inrush

U_{i nom}, I_{o max}

0

(See figures 23/24)

Reflected Input Ripple Current

(See figure 21)

Stand-by Power

I_{i R}

U_{i nom}, I_{o max}

10

mAp-p

W

P_{i off}

Shut down active

0.3

0.5

External Input Capacitance for

stable Operation [µF/P_o]

(See page 22)

µF /

C_i

100

125 W

¹Preliminary data

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Table 2: Output Specification

Parameter

Conditions/Description

Min

Nom

Max

Units

Set Point

TXSxxxZY

TXSxxxZA

TXSxxxZB

TXSxxxZC

TXSxxxZD

1.194

1.492

1.791

1.990

2.487

1.2

1.5

1.8

2.0

2.5

1.206

1.508

1.809

2.010

2.513

U_o

U_{i nom}, 50% I_{o max}

T_A= 25 °C

,

V DC

Output Voltage Accuracy

± 0.5

% U_o

U_{i min}to U_{i max}

,

Static Line Regulation

± 0.05

± 0.1

I_{o max}, T_A= 25 °C

(see figure 9)

U_{i nom}

,

Static Load Regulation

(see figure 10)

± 0.1

% U_o

0 to 100 % I_{o max}, T_A= 25 °C

U_{i nom}, I_{o max}

Output Voltage Deviation over

± 0.3

± 1

% U_o

Temperature Range

U_oOverall Tolerance

Output Voltage Ripple and Noise

(see figures 17/19)

RMS

U_{i min}to U_{i max}, I_{o min}to I_{o max}

T_A= 25 °C

U_r

7

30

16

70

mV

% U_{o nom}

20 MHz Bandwidth

Peak to Peak

Output Voltage Trim Range ^{1 / 3}

U_TR

U_{i min}to U_{i max}, I_{o min}to I_{o max}

± 10

2/ 3

Output Current

0

75

80

TXS75xx

TXS80xx

TXS100xx

TXS120xx

I_o

U_{i min}to U_{i max}

A DC

100

120

Output Current Limit Threshold

I_lim

Hiccup, self recovery ⁴

110

130

% I_{o nom}

Efficiency

88.0

87.5

89.0

88.5

90.0

89.5

91.0

90.5

91.0

90.5

TXS75ZY

TXS100ZY

TXS75ZA

TXS100ZA

TXS75ZB

U_{i nom}, I_{o max}

%

η

TXS100ZB

TXS80ZC

TXS100ZC

TXS80ZD

TXS100ZD

(see figures 1-4)

Switching Frequency

Input and Output Ripple

Frequency

F_s

190

760

kHz

4·F_s

Dynamic Load Regulation

(see figures 11/12)

Peak Deviation

∆I_o= 25 A, dI_o/dt = 2 A/µs

T_A= 25 °C

± 10

100

% U_{o nom}

µs

Settling Time

Start Up Time (over U_ior

ON/OFF) (see figures 14-16)

Admissible Load Capacitance

(see figures 15/16)

U_{i nom}, I_{o max}

11

15

ms

C_o

0

100

mF

1

3

2

Wide trim range optional

No minimum load required

Reduced output power of models ZB (1.8 V) and ZD (2.5 V) at minimum input voltage, highest base plate temperature

and increased U_o(via Trim or Sense). Explanation and limits see page 16.

Timing diagram hiccup mode: see figure 37.

4

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Table 3: Control Specification

Parameter

Conditions/Description

U_{i nom}

Referenced to

V_i(-) (pin 1)

Min

Nom

Max

Units

Shut Down Control ¹(ON/OFF, Pin 3)

Unit disabled if shut down low

Unit operating if active high or open

-1

1.5

5.5

V

Inverse Shut Down^{1 / 3}(ON/OFF, Pin 3)

Unit operating if shut down low

U_{i nom}

referenced to

V_i(-) (pin 1)

-1

1.5

5.5

V

Unit disabled if active high or open

Standard shut down, U_SD= 0

Inverted shut down, U_SD= 0

0.02

0.12

mA

Shut Down Sink Current (I_SD

)

Referenced to

Trim Input ²

(Trim, Pin 7)

0

U_o

sense (-) (pin 8)

V

Trim Input Impedance

20

kΩ

1

2

3

Shut down control signal = TTL compatible, see page 14

Control function and block diagram for U_oadjustment over a trim voltage U_TRor a trim resistor R_TRsee pages 13/14.

Inverse shut down = option N.

Table 4: Protection Specification

Parameter

Conditions/Description

Min

Nom

Max

Units

V

Input Under Voltage Lockout

Turn on

34

32

36

Turn off

Hiccup (self recovery)

31

110

Overload Protection

Output OVP

130

% I_{o max}

Continuous limitation,

no switch off

1

Models ZA, ZB, ZY

125

115

% U_{o set}

Models ZC, ZD

Automatic recovery

(Thermistor)

Measurement point on PCB

Over Temperature Shut Down

120

5

°C

K

Over Temperature Hysteresis

1

U_{o set}: Output voltage adjusted over trim or sense.

EMC and Reliability Specification

Table 5: EMC

Parameter

Electrostatic Discharge

Air

Conditions/Description

Value

Performance

IEC/EN 61000-4-2, level 4

15 kV

3 V/m

U_{i nom}, I_{o max}

criterion A ¹

Contact

Electromagnetic Field

Fast Transients/Burst

To Input

To Output

Electromagnetic Emission

IEC/EN 61000-4-3, level 2

IEC/EN 61000-4-4, level 4

8 kV/2.5 kHz

2 kV/5 kHz

B

U_{i max}, I_{o max}

criterion A ¹

CISPR 22/EN 55022, conducted ²

pass

3

1

2

3

See page 22

Radiated emissions depend heavily on the implementation.

With external filter, see pages 20/21

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Table 6: Reliability

Parameter

Conditions/Description

Value

Calculated MTBF ¹

Ground benign, full load

T_BP= 80 °C

44.6 years / 390 kh

31.7 years / 277 kh

21.8 years / 191 kh

Acc. MIL-HDBK 217F Notice 2

(See pages 12/25)

T_BP= 90 °C

T_BP= 100 °C

Burn In

Manufacturing Facilities

Full load

24 h

ISO 9001 certified

1

Further information on MTBF: See reliability report on TXS product CD ROM

Environmental and Mechanical Specification

Parameter

Conditions/Description

Min

Nom

Max

Units

Damp Heat

IEC/EN 60068-2-3, 93 %, 40 °C

56

Days

1

Shock

IEC 60068-2-27

6 ms, 3 shocks in each direction,

100

g_n

Unit operating

1

Sinusoidal Vibration

IEC 60068-2-6,

0.7

10

mm

g_n

10…60/60…2000 Hz

Unit operating

1

Random Vibration

IEC/EN 60068-2-64,

2

20…500 Hz,

0.07

40

g_n/Hz

Unit operating

Bump

IEC/EN 60068-2-29,

6 ms, 1000 shocks in each direction,

Unit operating

g_n

Water Cleaning

Standard cleaning and drying process ²

1

2

Unit secured with the four case mounting screws on the PCB during the tests. The test BPC had a size of

176x137x3.3 mm

Cleaning with Vigon A200. For parameters and alternative cleaning procedures consult factory.

Inadequate cleaning and drying procedures can adversely affect the reliability of the module.

Application Notes

Application notes and full measurement reports are included on the TXS Product CD ROM, which is

available on request. Ask your local representative.

Title

Thematic

Reliability Report TXS Series

Reliability prediction background. Calculation for TXS-series

Reliability and Derating of DC-DC Bricks with

Comparison of different design concepts and its effects on brick

Optimised Mechanical Construction

temperature and reliability

Thermal Performance of TXS

TXS Layout Considerations

Thermal basics, design rules for system integration

How to implement a 100 A module on a PCB

Second source issues. Comparison to two paralleled 60A bricks

Second Source Solutions for TXS

TXS EMI and EMC Report

Next generation of TXS modules

TXS Stability Prediction

TXS Thermal Dimensioning (Calculator)

EMC basics, EMC performance of TXS series

Preliminary data: Product optimisation, Outlook

Interactive tool to predict dynamic step response

Interactive tool to find the required airflow, the maximum allowed

output current, the base plate temperature and the resulting MTBF

TXS Design verification Reports

TXS Design Maturity Test

Extended Design Integrity Test

Thermal measurement results

TXS Product Presentation

Measurement data over temperature for different TXS types

Accelerated ageing tests measurement report

Stress tests measurement report

Database (thermal pictures)

Power point document

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Characteristic Curves

The following figures show typical characteristics for the TXS bricks at T_A= 25 °C / 400 LFM.

Efficiency:

TXS Efficiency at Ui = 36V

TXS Efficienc

y

a

t Ui = 48V

92

91.5

91

92

91.5

91

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

90.5

90

90.5

90

89.5

89

89.5

89

88.5

88

88.5

88

87.5

87

87.5

87

86.5

86

86.5

86

0

20

40

60

80

100

0

20

40

60

80

100

Output Current [A]

Figure 1

Figure 2

TXS Efficienc

y

a

t Ui = 60V

TXS Efficienc

y

a

t Ui = 75V

92

91.5

91

90

89.5

89

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

90.5

90

88.5

88

89.5

89

87.5

87

88.5

88

86.5

86

87.5

87

85.5

85

86.5

84.5

86

0

84

0

20

40

60

80

100

20

40

60

80

100

Output Current [A]

Figure 3

Figure 4

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Power loss figures:

TXS loss at Ui = 36V

TXS loss at Ui = 48V

30

25

20

15

10

5

30

25

20

15

10

5

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

TXS100ZA

TXS100ZB

TXS100ZD

0

20

40

60

80

100

0

20

40

60

80

100

Output Current [A]

Figure 5

Figure 6

TXS loss at Ui = 60V

TXS loss at Ui = 75V

30

25

20

15

10

5

35

30

25

20

15

10

5

TXS100ZY

TXS100ZA

TXS100ZB

TXS100ZD

TXS100ZA

TXS100ZB

TXS100ZD

0

20

40

60

80

100

20

40

60

80

100

Output Current [A]

Figure 8

Figure 7

the dissipation of the converters is increased

because of the positive temperature coefficient

of copper and MOS FETs. The loss at a specific

base plate temperature can be estimated using

table 7 on page 15.

Output power:

Input power:

Efficiency:

P_o= U_o· I_o

P_i= U_i· I_i

η = P_o/ P_i

Dissipation:

P_Loss= P_i- P_o= P_o· (1 / η

- 1)

The report “Next generation TXS modules”

shows preliminary data of power loss and

efficiency. Depending on the type, the no load

and at full load loss can be reduced by up to 7W.

Efficiency and power loss of high output current

converters are difficult to measure. See figure 36

Figures 1-8 are typical curves, measured at ambient

temperature. At elevated base plate temperatures

.

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Line and Load Regulation:

1.4

1.2

1

1.2

1

0.8

0.6

0.4

0.2

0

Vi = 37 V

Vi = 51 V

Vi = 75 V

Io = 0 A

0.8

0.6

0.4

0.2

0

Io = 45 A

Io = 90 A

-40

-25

0

25

50

75

90

-40

-25

0

25

50

75

90

Temperature [°C]

Figure 10: Load Regulation TXS100ZD

I_o= 0…90 A, T_A= -40…+90 °C

T_BP= 100°C

Figure 9:

Line Regulation TXS100ZD

U_i= 37…75 V, T_A= -40…+90 °C

T_BP= 100°C

For correct measurement results, the sense pins should be connected directly to the power pins.

Dynamic Response:

Negative Load Step: dI_o= 25 A

Positive Load Step: dI_o= 25 A

Ch1: V(U_o), 50 mV/div. Ch3: I_o, 20 A/div.

time 40 µs/div.

Ch1: V(U_o), 50 mV/div. Ch3: I_o, 20 A/div.

time 40 µs/div.

Figure 12: TXS100ZD Load Step 100 A to 75 A

@ T_A= 25 °C, U_i= U_{i nom}

Figure 11:

TXS100ZD Load Step 75 A to 100 A

@ T_A= 25 °C, U_i= U_{i nom}

The apparent overshoot in the output voltage load step recovery is due to an overshoot in the current drawn

by the electronic load. The dynamic performance of the converter at different dI_o/dt and different capacitive

loads can be estimated with an interactive tool on the TXS CD ROM.

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Remote Turn off

Remote Turn on

Ch1: V(U_o), 0.5 V/div. Ch2: V(U_SD), 2 V/div.

time: 200 µs/div.

Ch1: V(U_o), 0.5 V/div. Ch2: V(U_SD), 2 V/div.

time: 4 ms/div.

Figure 14: TXS100ZD remote turn on

Figure 13: TXS100ZD remote turn off

@100 A, T_A= 25 °C, U_i= U_{i nom}

Switching on U_iwith C_o= 34 mF

Remote Turn on with C_o= 34 mF

Ch1: V(U_o), 0.5 V/div. Ch2: V(U_SD), 2 V/div.

Ch1: V(U_i), 10V/div.

Ch2: V(U_o), 0.5V/div.

time: 4 ms/div.

time: 2 ms/div.

Figure 15: TXS100ZD remote turn-on:

@100 A resistive and 34 mF ¹

capacitive load, @ T_A= 25 °C

U_i= U_{i nom}, td = 11 ms

Figure 16: TXS 100ZB U_iswitch-on: 0 to 75V

@100 A resistive and 34 mF ¹

capacitive load, @T_A= 25 °C

td = 12 ms

The turn on and off curves are typical, but they look almost identical at all input voltages [36...75 V],

temperatures [-40...+100 °C] and for all models [1.2...2.5 V]. The same curves apply whether the module is

switched using the remote signal or the input voltage.

Figures 15 and 16 show that TXS modules are capable of monotonic start up into loads with very high or

very low impedance without stability problems.

1

The ESR of the 34 x 1 mF Tantalum capacitors is < 0.3 mΩ in total.

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Output Ripple

Cin = 220 uF/100 V

ESR < 0.1 Ohm, 100 kHz

Electronic load

Vi(+)

Vi(-)

Vo(+)

Vo(-)

DC Supply or

+

Battery

1 uF X7R // 22 uF

Tantal 10 V / B

TXS module

Rshunt = 1 mOhm

Scope

Primary wiring inductance

approximately 2 uH

@20 MHz BWL

3 cm

coaxial cable

time: 1 us/div.

Figure 18: Output Ripple Test Set Up

Figure 17: Output Ripple TXS100ZD

@ I_o= 100 A, U_{i nom}, T_A= 25 °C

mVpp

@ - 40 °C

@ + 25 °C

@ + 100 °C

Figure 19: Output Ripple of TXS100ZD over Line, Load [0..90A] and Temperature

Reflected Input Ripple

Current probe

Electronic

Load

Lin 12 uH

I _{i AC}+ I _{i DC}

I

i R

D U T

T X S 1 0 0 Z D

Cin 100 uF

(0.1 Ohm)

Figure 20: Input Current Reflected Ripple Test Set Up

35

30

25

Figure 22:

AC-part of the converter input current I_i

.

20

15

10

5

Iin pp

[mA]

AC

measured on a TXS100ZD at T_A= 25 °C,

U_i= 75 V. Upper curve: full load; lower curve:

no load. 0.2 A/div. time = 2 µs/div.

0

36

40

44

Figure 21:

48

52

Uin [V]

56

60

64

Reflected input current I_iRpp:

Measured on a TXS100ZD at full load

and ambient temperature.

68

72

76

Io [A]

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Inrush Current

MTBF Figures

1000

ON/OFF Signal

U_o@ U_i=75 V

U_o@ U_i=36 V

100

I_iwith 200 mA/div

10

1

GB

GF

20

30

40

50

60

70

80

90

100

Ch 1: I_in@ 75 V, 0.2 A/div., Ch R1: I_in@ 36 V, 0.2 A/div.

Base-Plate Temperature [°C]

Ch 2: ON/OFF signal,

Ch 3: U_o@ U_i= 75 V, 1 V/div.

Ch R3: U_o@ U_i= 36 V, 1 V/div.

time: 2 ms/div.

Figure 26: Calculated MTBF Values for Ground

Benign and Ground Fixed at Different

Base Plate Temperatures

Figure 23: No Load Inrush Current

TXS100ZD-NP2, Inhibit Switch On

U_i= 36 V and 75 V

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

ON/OFF Signal

U_o@ U_i=75 V

U_o@ U_i=36 V

after 10 years

after 8 years

after 6 years

after 4 years

I_i@36Vwith 2 A/div

I_i@75Vwith 2 A/div

20

30

40

50

60

70

80

90

100

Base-Plate temperature TBP [°C]

Ch 1: I_in@ 75 V, 2 A/div., Ch R1: I_in@ 36 V, 2 A/div.

Ch 2: ON/OFF signal, Ch 3: U_o@ U_i= 75 V, 1 V/div.

Figure 27:

Probability of Survival at Ground

Ch R3: U_o@ U_i=36 V, 1 V/div.

time: 2 ms/div.

Benign (T_BP)

Figure 24: Full Load Inrush Current

TXS100ZD-NP2, inhibit switch on

U_i= 36 V and 75 V

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

Cin = 220 uF/100 V

after 10 years

ESR < 0.1 Ohm, 100 kHz

Resistive load

after 8 years

after 6 years

after 4 years

Vo(+)

Vo(-)

Vi(+)

Vi(-)

DC Supply

I(lim) = 16 A

+

U_o(t)

I_i(t)

TXS module

Rshunt = 10 mOhm

20

30

40

50

60

70

80

90

100

Base-Plate temperature TBP [°C]

Primary wiring inductance

approximately 6 uH

Digital Scope

20 MHz BWL

Current Probe

Figure 28: Probability of Survival at Ground

Figure 25: Inrush Current Measurement Set Up

Fixed (T_BP)

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Trim function controlled by an adjust resistor

Output Voltage Trimming

116%

114%

112%

110%

108%

106%

104%

102%

100%

98%

Radj connectet to Uo -

Radj connected to Uo+

The Trim feature allows the user to adjust the

output voltage in the range 90 …110 % U_{o nom}

.

The output voltage can either be adjusted using an

external resistor or with an external voltage source.

The adjust resistor should be connected close to

the unit. The voltage source should be connected

to sense (-).

96%

94%

92%

90%

Adjustment of U_owith an external resistor

The trimming resistor needed to reach U_{o Set}can be

calculated using equations 1 and 2:

88%

0.1

1

10

100

1000

Adjustment Resistor Value [kOhm]

Figure 31: Trim with an external adjust resistor

Increasing the output voltage:

To increase the output voltage a resistor should be

connected between pins 4 and 7 as indicated in

the figure below.

Adjustment of U_owith an external voltage

The required adjust voltage can be determined

using equation 3.

Vi (+)

Vo (+)

Sense (+)

2

6

4

Vi (+)

2

3

Vo (+)

6

4

R Load

Sense (+)

3

R _TR

ON/OFF

- Up

Trim

7

R Load

7

ON/OFF

Trim

Sense (-)

Vo (-)

+

8

5

U _TR

1

Vi

(-)

Sense (-)

Vo (-)

8

5

1

Vi (-)

Figure 29: Trim up

Figure 32: Trim up and down with an external

voltage source referenced to sense (-)

R_{TR - up}[k] = 2.4k · U_o/(U_o- U_{o nom}) – 17.6k

1)

U_TR[V] = (U_o– 0.88 · U_{o nom})/0.24

3)

Decreasing the output voltage:

To decrease the output voltage a resistor should

be connected between pins 7 and 8 as indicated in

the figure below.

By connecting pin 7 to Vo (+), the output voltage is

set to 112 %. By connecting pin 7 to Vo (-), the

output voltage is set to 88 %.

Trim function controlled by an adjust voltage

Vi (+)

2

Vo (+)

Sense (+)

6

4

112%

R Load

108%

104%

100%

96%

3

7

ON/OFF

Trim

R _TR

- Down

Sense (-)

Vo (-)

8

5

1

Vi (-)

Figure 30: Trim down

92%

R_{TR - down}[k] = 2.4k · U_o/(U_{o nom}- U_o) – 17.6k

2)

88%

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

Uadj / Uo(nom)

Figure 33: Trim with an external adjust voltage

Example: R_TRto trim up U_oto 106% is needed

Example: U_TRto trim U_oof the TXS100ZB to 90 %

R_TR-up[k] = 2.4k · U_o/(U_o- U_{o nom}) – 17.6k

R_TR-up[k] = 2.4k · 1.06/(1.06 – 1) – 17.6k

R_TR-up[k] = 24.8k

TXS100ZB U_{o nom}= 1.8 V

U_o= 0.9 · 1.8 V = 1.62 V

U_TR= (1.62 – 1.584) / 0.24 = 0.15V

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Limits:

The shut down function is TTL compatible. U_SD

The combined U_oset by trim and sense should not

exceed 120 % U_{o nom}. The minimum U_oset by trim

should not be set below 88 % U_{o nom}. For increased

trim range use the option wide trim (option R).

should be kept below 5.5 V. Alternatively an open

collector switch or equivalent can be used. The

remote control pin is pulled up internally, so that no

external voltage source is required. A bipolar

transistor, a FET or an opto coupler output can be

used as a switch.

Note:

When the output voltage is trimmed upwards, the

output power P_ofrom the converter should not

exceed its maximum rating P_o. (The voltage

directly at the output pins multiplied by the output

current).

The user should take care that the shut down

control signal is referenced directly to Vi(-) close to

the converter pins.

2

Vi (+)

Vo (+)

6

4

Open collector

switch

Sense (+)

Input Filter

3

7

ON/OFF

Trim

Wide Trim Range

U_SD

The wide trim range option (option R) will allow an

Sense (-)

Vo (-)

8

5

extended adjustment range of 70…110 % U_{o nom}

,

1

Vi (-)

Option R covers two neighbouring output voltages.

If trimmed down, the converters perform identically

to the standard types, if trimmed up, the converters

have slightly increased loss compared to the

standard types.

Figure 34:

Shut down

Shut down is active after a delay of approximately

300 µs and has a soft restart after typically

6-10 ms. (see figures 13/16).

The adjustment functions differently for the wide

The turn on over the shut down function does not

create any inrush current and has a monotonic

form without overshoot. (see figures 22/23).

trim range as for the standard trim:

Adjustment of Vo with an external voltage

U_TR[V] = (U_o– 0.7 · U_{o nom})/0.42

If the shut down control pin is not used, it can be

left open. With option N the shut down pin must be

hard wired to the Vi(-) pin.

Adjustment of Vo with an external resistor

Uo increasing: (R_TRconnected to V_o(+))

Remote Sense

R_{TR - up}[k] = 2.4k · U_o/(U_o- U_{o nom}) – 14k

Remote sense compensates for distribution losses

by regulating the voltage at the remote sense

connections.

Uo Decreasing: (R_TRconnected to V_o(-))

R_{TR - down}[k] = 6k · U_o/(U_{o nom}- U_o) – 14k

When the trim pin is left open, the converter

regulates to U_{o nom}. The input impedance of the trim

pin is equal to the standard trim 20 kΩ. When

trimming with an external voltage source

U_{o Set}is U_{o nom}at U_TR= U_{o nom}/1.4 .

Vi (+)

Vo (+)

2

6

4

Sense (+)

R Load

3

ON/OFF

7

Trim

10R

8

5

Sense (-)

Vo (-)

1 Vi (-)

Shut Down Feature

Figure 35:

Remote Sense

The shut down (ON/OFF control, pin 3) is available

with positive logic or with negative logic as an

option. Shut down is referenced to V_i(-).

The sense pins are internally connected to the

power pins over 10 Ω resistor, to prevent an

uncontrolled output voltage in case of interrupted

sense wires.

Positive logic:

Unit off, when pin 3 pulled to V_i(-) or U_SD<1.5 V

Unit working, when pin 3 open or U_SD>1.5 V

To minimize noise pick up, appropriate layout

techniques should be used. The sense wires

should not be wired in loops, but close together. If

possible sense should be placed on top of a layer

Negative logic: (Option -N)

Unit off, when pin 3 open or U_SD>1.5 V

Unit on, when pin3 pulled down to V_i(-)

or U_SD<1.5 V

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Open sense wires result in measurement errors. A

with the negative return Vo (-). More layout

low drop precision shunt, rated for 100A should be

information can be found on the TXS CD ROM.

used to measure the output current.

The following points should be observed, when

To remember: At 100 A, a 1 mΩ resistor in trace

or over a bad contact in the measurement set up

can produce as much as 100 mV of voltage drop

or a measuring error of 100 mV · 100 A = 10 W !

The loss and efficiency measurements in the

graphs were done in a test system at room

temperature. To calculate the approximate

dissipation at elevated base plate temperatures,

the correction factors of the following table can be

used:

sense wires are used:

•

The output voltage of the TXS modules should

not be increased above +20 % of U_{o nom.}This

limit includes any increase due to remote

sense and an output voltage set-point

adjustment over the trim function.

The output power of the TXS module is

defined as the output voltages at the power

pins multiplied by the load current. When the

output voltage is increased to compensate

voltage drops, the output power from the

converter is increased as well. The power

should not exceed its maximum rating.

I_o/ T_BP

110 100

90

80

70

60

46

100A

80A

60A

1.18 1.12 1.08 1.05 1.03 1.02

1.11 1.09 1.07 1.05 1.03 1.01

1.07 1.06 1.04 1.03 1.02 1.01

1

•

If not used, the remote sense pins have to be

connected as short as possible to Vo (+) and

Vo (-) respectively. If not connected, the

output voltage shows an increased line and

load regulation.

Table 7:

Correction factor

k

for different

output currents at elevated base

plate temperatures T_BP.

Dissipation at T_A: P_Loss= P_i- P_o= P_o· (1/η - 1)

Dissipation at T_BP: P_Loss(TBP)= P_Loss(Graph)· k

•

The sense wires are loaded with a small signal

current. Do not place resistors or filters into

the sense wires.

The PCB layout of the power tracks to the load

should result in a low wiring inductance.

Otherwise the dynamic performance even with

sense wires is degraded.

The dissipation at elevated base plate

temperatures is needed to determine the cooling

requirements ( page 23: Thermal considerations).

Æ

Output Over Voltage Protection

•

Do not use filter capacitors between sense

and power pins. They could possibly influence

the stability of the module.

The units have a built in over voltage protection,

which prevent an uncontrolled increase of the

output voltage in case of catastrophic failures of

the converter. The over voltage protection consist

of a second control loop, which is independent of

the main regulating circuit.

Power loss and Efficiency

The protection is set to 125 % U_{o set}(Models ZY,

ZA, ZB, ZC) and 115 % U_{o set}(Model ZD).

The measurement of loss and efficiency at very

high output current converters is quite difficult. To

avoid measurement errors, a Kelvin connection

directly at the module terminals should be used.

sense should be wired directly to the power pins.

The over voltage protection is not switching, but

regulating, so that the converter can’t be

accidentally turned of by noise or EMI. Output

voltage adjustment over sense or trim can’t trigger

the over voltage protection, because the protection

I_i

I_o

Vi (+)

2

3

Vo (+)

6

4

level is tracking with U_{o set}

.

Sense (+)

R Load

+

7

ON/OFF

Trim

U_i

Operation in Parallel

U_o

U_{SH =}R_{SHi *}I_i

Paralleling of two converters is not possible.

U_{SH =}R_{SHo *}I_o

Sense (-)

Vo (-)

8

5

1

Vi (-)

Operation in Series

TXS units can be connected in series. Consult the

Figure 36:

Efficiency Measurement Set Up

factory for additional information if

connection of modules is planned.

a

serial

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Output Over Current Protection

Energy of the overload current

7000

6000

5000

4000

3000

2000

1000

0

When the converter output is overloaded or

shorted, the module will go into hiccup mode. In

the hiccup mode, the brick is switched off

completely and restarted after

a

period of

approximately 550 ms. If the overload- or short

circuit is still present then, the converter will hiccup

until the overload is removed.

In order to be capable of starting large capacitive

loads, the converter provides a minimum on time

of approximately 30 ms.

100

102

104

106

108

110

112

114

Output current TXS100 [A]

Io_peak

², proportional to the

Io(t) Hiccup mode

delta Io =

Io_{peak -}Io _Lim

Figure 39: Function of I_o

thermal energy^ra^mt^sthe overload location

Io_lim

110

Low Input Voltage

Input under voltage lookout

Up to 800 ms

time

The unit is equipped with an input under voltage

lockout circuit, which ensures a defined start up

sequence.

off time = constant

550 ms typ

R Load

on - pulse duration

see graph

ton _min30 ms

0.8

Nominal load

Turn-On

Turn-Off

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

Overload

time

Short circuit

Figure 37:

Hiccup Timing at Overload

With increasing overload, the peak output current

is slightly increased (delta I_otypically up to 13 A).

At the same time the on pulse duration is reduced,

so that the total energy in an overload condition is

limited.

29

30

31

32

33

34

35

36

Vi [V]

Typical "on-pulse" duration in overload

Figure 40: TXS under voltage on / off hysteresis at

light load

14

12

10

8

Reduced output power of models ZB, ZD

The models ZB (1.8 V) and ZD (2.5 V) have a

reduced output power at minimum input voltage

when operated at highest base plate temperature

6

4

2

and increased U_o

(over Trim or Sense). The

Set

reduction is due to a duty cycle limitation of the

controller.

0

200

400

600

800

1000

Puls duration [ms]

The rated output power of these two types [180 W

resp. 250 W] is available under the following

conditions:

Figure 38: Characteristic of over current protection

The off period allows hot tracks and loads to cool

U_{i min}>37 V: for T_BP= 100 °C and U_o= U_{o nom}

down. The heating energy at the location of the

U_{i min}>40 V: for T_BP= 100 °C and U_o= 112 % U_{o nom}

2

short circuit and in the PCB is proportional to I_rms

.

·

2

At low input voltage, the ZB and ZD models will

switch off and soft restart periodically. The

operation is very similar to an under voltage

lockout or over current protection.

The following graph shows, that I_rms= I_o

ton/T is reduced at high overload, which re^pd^uu^lsc^ees

the danger of overheating and further damage to

the system.

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

components, because they are bridging the safety

Over Temperature Protection

barrier between primary and secondary. Safety

agencies don’t allow operation of the opto-couplers

over the rated temperature, which is in almost

every case 100 °C.

These units feature

a

non latching over

temperature protection circuit to prevent thermal

damage in case of failures of the cooling system.

A

second function of the over temperature

Competition single board converters might be

specified for 120 °C or even 130 °C PCB operating

temperatures, but can‘t be operated at this point

because of the on board opto-couplers. Safety

agencies will insist on a temperature reduction of

up to 30 K.

protection, is to prevent long term operation at

elevated temperatures due to poor thermal system

design. Long time thermal overload reduces the

reliability of the converters.

A PTC measures the surface temperature of the

PCB near the main transformers. The temperature

protection switches the converter off completely at

approximately 120 °C. After cooling down by 5 to

10 Kelvin, the converter is restarted.

Thermal time constant

TXS modules have a large thermal time constant

of approximately 7 K/Min. A large time constant

increases the converter ruggedness. It allows short

term operation at overload without triggering the

temperature protection. In case of changing loads,

←

PTC

the converter operates at

a lower average

temperature which improves the expected lifetime.

Finally a large time constant gives additional

operating time after a break down of the cooling

system.

←

OPTO-COUPLER

Figure 41: TXS100-ZY at 300 LFM, U_i= 48 V,

I_o= 100 A, T_A= 27.9 °C, T_BP= 59.7 °C,

T_PCBmax= 74.1 °C, dT = 14.4 K

Hot Spots

TXS modules have large component and material

safety margins. The temperature protection is not

set close to destructive limits. Laboratory tests with

disabled protection at an on board temperature of

170 °C (24 h, full load) showed no performance or

material degradation after cooling down.

The thermal picture of a TXS-

module, underlayed with layout

data shows clearly that hot spots

are successfully avoided. The

temperature distribution in the

Survival under such extreme operating conditions

is only possible, when a converter has a uniform

temperature distribution without any hot spots. Hot

spots are peak temperatures considerably above

the neighbouring components. Hot spots can be

seen quite often in converters without base plate

and are the result of a poor thermal design.

middle

section

with

the

synchronous rectifiers is flat. The

temperature rise above the base

plate is only 14.4 K.

The red area is the only warm

section on a TXS. All other power

Converters with hot spots need a large derating or

they will suffer a large reduction to the expected

life time.

components are located on the

bottom of the board where they are in direct

thermal contact with the base plate. A thermally

conductive potting material keeps the temperature

rise above the base plate to below 2 K.

Opto Couplers

On TXS modules, thermally sensitive components

such as the opto-couplers are placed on a much

cooler, separate hybrid circuit. opto-couplers see a

highly accelerated aging at operating temperatures

above 100 °C. Additionally they are safety critical

Detailed information on the mechanical concept of

the converter, the thermal system design rules and

measurement results are available on the TXS

product CD ROM (available reports see page 6).

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Definitions

Safety Considerations

The following section should help to classify the

supplying circuit of the converter. For the precise

identification of the voltage types in a system, the

relevant safety standard should be used.

Primary circuit = Circuit connected to the AC mains

which makes it hazardous per definition.

TXS modules have been designed for building into

system applications in pollution degree

2

environments ¹.

The converters provide basic insulation¹from

input to output and from input to the metallic base

plate. The insulation supports 1500 V DC electric

strength test voltage and has an insulation

resistance >50 MΩ.

Secondary circuit = Circuit which is isolated from a

primary circuit. A battery without connection to a

primary circuit is considered to be a secondary

circuit.

The converters provide functional insulation¹

between output and base plate. The insulation

supports 500 V DC electric strength test voltage.

The base plate is normally floating. For safety

reasons the base plate may only be connected to

the secondary or safety ground.

SELV, ELV and TNV are secondary circuits.

SELV: Safety Extra Low Voltage

ELV:

TNV:

Extra Low Voltage

Telecommunication Network Voltage

If the system using the converter requires safety

agency approval, certain rules should be followed

in the design of the system. In particular, all

creepage and clearance distance requirements of

the appropriate standard should be observed. This

document refers to UL 60950, EN 60950:2000 and

CSA 60950-00 only. Specific applications may

have additional requirements.

SELV = User accessible secondary circuit with

U <60 V DC and no transients. An SELV circuit

remains safe even after single faults.

ELV = Basic insulated circuit with the same limits

as a SELV circuit but without protection to 60 V in

case of a single fault.

TNV = Double or reinforced insulated secondary

circuit, isolated from earth and connected to a

telecommunication network or a circuit meeting the

TNV specifications.

• The converter has no internal fuse. An external

fuse should be provided to protect the system. For

UL purpose the fuse needs to be UL-listed. A fuse

rating not greater than 10 A is recommended. The

user can select a lower rating fuse based upon the

inrush transient of the input filter and the maximum

input current of the converter (see page 2). Both

input tracks and the chassis ground track (if

applicable) should be capable of conducting a

current of 1.5 times the value of the fuse without

failure. The fuse should be placed in the non-

grounded input line.

• The maximum specified input voltage is 100 V

DC for 100 ms. Exceeding of this voltage limit may

destroy the input stage of the converter but it will

not damage the insulation ².

• If an input supply other than SELV is used, the

components on the primary of the converter may

need to be considered as hazardous. The report:

“TXS layout considerations” on the TXS CD ROM

provides recommendations for the PCB layout

beneath the converter.

Table 8: Normal condition:

With

Without Transients

Transients ¹

TNV-1

ELV

SELV

<60 V DC or 42.4 V AC peak

TNV-3

TNV-2

<120 V DC or 70.7 V AC peak ²

Table 9: Maximum voltage after a single fault:

With

Without Transients

Transients ¹

TNV-1

<120 V continuous ³

ELV

SELV

<60 V, 120 V

for 0.2 s max

Possibly

hazardous

TNV-3

TNV-2

<120 V continuous ³

1

2

Up to 1.5 kV transients possible.

For DC voltages with overlaid AC voltages the limit:

U

_AC/70.7 V + U_DC/120 V < 1 applies.

1

Exception: According deviation 2 in UL60950, the limit

80 V DC instead of 120 V DC applies in a DC-power

system for TNV2.

According to UL 60950, EN 60950:2000, CSA 60950-00

²The creepage and clearance distance and the insulation

thickness were dimensioned for 200 V DC. The

converters have been approved for basic insulation. It is

in the responsibility of the customer to use the converter

in applications, where supplementary insulation is

required.

3

In the event of a single fault, the voltage can

rise to 1500 V for 1 ms, then fall down to 400 V within

14 ms and stay at 400 V DC over 185 ms. Limiting

curve, see figure in IEC 60950:2000.

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

User accessible output

- A protective device limiting U_oto 60 V DC

max. should be connected between the

output lines of the TXS. (Clamp, Suppressor

Diode, …)

If a circuit connected to the converter output is

operator accessible, the output should be SELV.

The following table shows some possible

installation configurations. However it is the sole

responsibility of the installer/system designer to

assure the compliance with the relevant and

applicable safety regulations.

- The output should be earthed.

- The earth connections and the protective

device should be adequately dimensioned to

allow the fuse to reliably interrupt.

- The power system consisting of the TXS

modules and the primary supply (see figure

42) should successfully pass the SELV

reliability tests.

The output is considered SELV, according to EN

60950:2000, UL 60950, CSA 60950-00, if one of the

following requirements is met in the system design:

Output circuit

Power Bus Voltage

(Input of TXS module)

note A/B

3: All of the following points should be fulfilled:

- The power bus and the output circuit needs

to be floating:

Earthed

Unearthed

SELV

- To achieve an ELV power bus voltage, the

front end needs at least basic insulation.

- The supply of the front end, which feeds the

power bus should have a nominal voltage

below 150 V AC or 200 V DC. A transient

protection to 1500 V peak is required.

- A protection diode is required on the input of

the module.

Earthed/Unearthed SELV

Earthed/Unearthed ELV

note 1

note 2/6

note 4, 5

note 3

Unearthed

TNV-1

TNV-2

TNV-3

note 5

note 4, 5

not

Earthed

allowed

hazardous secondary

note 2

4: To achieve a TNV power bus voltage, the

power bus should be isolated from any other

hazardous voltage including the AC mains by

reinforced insulation. In addition, it needs to

be reliably isolated from earth.

Unearthed

note 7

hazardous secondary

Table 10: Installation configurations to achieve

an SELV output with TXS modules.

5

An impulse or high voltage test is required.

TXS modules were already tested for this

requirement. If hand held equipment is directly

connected to the output circuit, the test should

be repeated together with this equipment (see

safety standard).

Intermediate power

Mains

Output circuit

~

+

SELV

AC-DC

frond end

or

Input

Fuse

TXS

Module

Battery *

-

6: The conditions for an ELV power bus need to

be fulfilled. To achieve an ELV power bus

voltage, the front end needs at least basic

insulation.

~

Earth connection

Suppressor Diode

* Battery insulated

from primary circuits

and

Earth connection

7: This configuration is only possible if the

manufacturing at Power-One follows a special

inspection program. Consult factory if

required. It is much easier, if the unearthed

hazardous voltage can be characterized as

TNV-2 circuit. (^Ænote 5 applies).

Figure 42: Supply system with TXS. All possible

additional elements are shown. See notes

1 to 7 if they are required or not.

Notes

A: An input fuse should be provided in the un-

earthed input path (fuses see pages 3/18).

B: The power bus voltage should be limited or

regulated to maximum 75 V DC in order of not

to damage the TXS modules.

ELV or TNV outputs

If the output of a TXS needs only to be an ELV or

TNV circuit, less stringent requirements apply.

The power module has an ELV output if the input

is ELV or hazardous with a nominal voltage below

200 V DC. The power module has a TNV output if

the input is TNV. No additional requirements apply.

For other combinations, consult the safety standards.

1: No additional requirements

2: All of the following points should be fulfilled:

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

EMC Specification

limits, level B is fulfilled in all cases.

The TXS generates EMI noise at the switching

frequency and all it’s harmonics.

One stage input filter

Only a small external filter with few components is

required, to reduce the conducted noise below the

limits of EN 55022 Class B.

There are two types of EMI: conducted and

radiated emissions. Conducted emissions are

currents generated by the converter, propagating

mainly over the input and output wires. Radiated

emission consists on electrical and magnetic fields.

F

L1

I_o

I_i

Vi (+)

2

Vo (+)

Sense (+)

6

4

R Load

U_o

U_i

+

3

7

ON/OFF

Trim

Conducted Noise

C2

C4

C1

Sense (-)

Vo (-)

Conducted or low frequency noise is measured

between the input lines and protective earth

between 150 kHz and 30 MHz with a measure-

ment receiver. Radiated high frequency noise is

measured as a field between 30 MHz and 1 GHz

with an antenna or with an absorber clamp on the

input/output wires

8

5

1

Vi (-)

C1, C2: 100 uF/100 V

C3, C3: 2.2 nF

L1: 1 mH, Ferrite

C3

Y

Figure 44: TXS with a one stage input filter.

C1, C2

= 100 uF/100 V (Rubycon YXA), C3,

C4 = 2.2 n/250 V (Wima MP3-Y). L1 = 1 mH; Ferrite

Measurement set up

µ_i= 10’000, 16 turns (B64290L658 T38 Epcos)

A TXS100ZB was selected as a representative unit

for all the EMI measurements. Other models use

similar layouts, have the same mechanical

construction and have similar internal voltages.

The unit was operated at full load with

approximately 200 LFM airflow. Additional input

filters were placed as close as possible to the pins.

The output of the converter was wired over 15 inch

(38 cm) cables to a resistive load.

The conducted noise was measured with a 50 Ω

LISN (Line Impedance Stabilization Network

according to EN 55022 and CISPR 22 and an

EMC measurement receiver (PMM 8000).

Figure 45: TXS100ZB-N with one stage input filter

according to Figure 44.

Peak measurement in the V_i(-) line.

No external filter

The TXS generates predominantly common mode

Two stage input filter

The following circuit combines two common mode

filter stages.

noise.

80 dBuV

Quasi Peak limit EN55011/22

70 dBuV

60 dBuV

50 dBuV

40 dBuV

C3

F

I_i

L2

L1

I_o

Vi (+)

2

3

Vo (+)

6

4

Sense (+)

R Load

U_o

U_i

+

7

ON/OFF

Trim

30 dBuV

20 dBuV

C2

C1

Sense (-)

Vo (-)

8

5

1

Vi (-)

Measured noise

Peak

10 dBuV

C1, C2: 100 uF/100 V

Average limit

C3, C3: 2.2 nF

Y

C4

0 dBuV

L1: 1 mH, Ferrite

L2: 7.5uH, MPP

10 MHz

30 MHz

1 MHz

150 kHz

Figure 46: TXS100ZB-N with a two stage input filter:

Figure 43: TXS100ZB-N at U_i

and full load

nom

without an input filter and unearthed

C1, C2 = 100 uF/100 V (Rubycon YXA), C3, C4 =

output. Peak measurement Vi (-) line.

Only peak measurements were made. If the peak

values are below the average and the quasi peak

2.2 n/250 V (Wima MP3-Y). L1 = 1 mH; Ferrite

µ =10’000, 16 turns

(B64290L658 T38 Epcos),

I

L2 = 7.5 uH, 125 u MPP Powder core (Magnetics

55050-A2)

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Figure 49: TXS100ZB-N with a one stage input

Figure 47: TXS100ZB-N with a two stage input

filter and an earthed output over an

inductor in the ground line according

to Figure 48

filter according to Figure 32.

Peak measurement in the V_i(-) line.

A two stage input filter can be used, if a better high

frequency damping is required.

Peak measurement in the V_i(-) line.

Two stage input filter and grounded output

Grounded output or grounded case

For safety reasons or to reduce possible EMI

coupling to the secondary, the output circuit may

need to be connected to protective earth.

Grounding the output or the case has a negative

influence on the EMI performance. To overcome

this problem, a two stage input filter is proposed

(see figures 50/51).

Alternatively, if the ground connection is needed

for safety reasons only, an inductor in the ground

line can be used (Figures 48/49). This solution

allows a safe connection and minimises high

frequency emission.

C3

I_i

F

L2

L1

I_o

Vi (+)

2

3

Vo (+)

6

4

Sense (+)

R Load

U_o

U_i

+

7

ON/OFF

Trim

C2

C1

Sense (-)

Vo (-)

8

5

1

Vi (-)

C1, C2: 100 uF/100 V

C3, C3: 2.2 nF Y

C4

L1: 1 mH, Ferrite

L2: 13mH, Amorph

Figure 50: TXS100ZB-N with a two stage input

filter and ground output.

C1, C2 = 100 uF/100 V (Rubycon YXA), C3, C4 =

According UL 60950, the ground inductor should

be capable to conduct 1.5 times the value of the

input fuse without failure. The overall impedance of

the connection should be below 0.1 Ω.

2.2 nF/250 V (Wima MP3-Y). L1 = 1 mH; Ferrite

µ = 10’000, 16 turns (B64290L658 T38 Epcos),

I

L2 = 13 mH, 15 turns, amorphous core (Magnetec

M128-01)

One stage input filter and ground Inductor

F

L1

I_o

I_i

Vi (+)

2

Vo (+)

Sense (+)

6

4

R Load

U_o

U_i

+

3

7

ON/OFF

Trim

C2

C4

C1

Sense (-)

Vo (-)

8

5

1

Vi (-)

C1, C2: 100 uF/100 V

C3, C3: 2.2 nF

L1: 1 mH, Ferrite

C3

L2

Y

Figure 48: TXS100ZB-N with a one stage input

filter according figure 44 and an

inductor in the ground line to the

output.

Figure 51: TXS100ZB-N with a two stage input

filter and an earthed output. Peak

measurement in the V_i(-) line

L2 = 9.6 mH, µ = 50’000, (VAC W620)

I

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Radiated Noise

On Board Input and Output Filters

The radiated noise from the converter is extremely

difficult to predict since it depends largely upon the

TXS converters use a topology that achieves input-

and output ripple frequencies four times higher

than the switching frequency. This results in

excellent ripple and noise values and low external

filter requirements.

motherboard

layout

and

the

switching

characteristic of the loads.

The report: “TXS layout considerations” on the

TXS product CD ROM provides recommendations

for reducing the radiated noise through shielding

and optimal layout.

The on board output filter is a parallel connection

of very low impedance Tantalum capacitors

connected in parallel with an overall capacitance of

3.3 mF. Total ESR < 4.5 mΩ (@100 kHz/25 °C).

Input Impedance

The high efficient on-board input filter consists of

several ceramic capacitors, a damping network

All switching power supplies exhibit negative input

impedance. A power source with inductive output

impedance and/or the wiring inductance from the

supply to the converter can affect the stability of

the modules.

and

a

filter inductor. Two EMC capacitors

(Cy1+Cy2) in a series connection with 2.2 nF

each, are connected between primary and

secondary.

A good general stability rule is, that the magnitude

of the source impedance should be lower than the

magnitude of the input impedance of the module at

Lin

1

6

TXS

power s tage

all frequencies up to the switching frequency. The

minimum input impedance of

a

module is

C2

C 3

C 1

calculated as 20 log(U_{i min}/ I_{i max}).

2

5

Example: At U_{i min}= 36 V and I_{i max}= 7.8 A (see

Table 1 on page 3), a TXS100ZD needs an AC-

impedance |Z_line| < 13.2 dBΩ at full load.

A possibility to reduce the input impedance is to

connect a low ESR input filter capacitor between

the input lines (at least 100 uF per 125 W output

power is recommended). With such a blocking

capacitor, a performance within the specifications

can be achieved with almost all supply conditions.

C y 1 + Cy 2

Figure 52: On board input and output filters.

C1 = 1 uF, C2 = 6 · (1 uF), C3 = 3 mF

Cy = 1.1 nF, Lin = 0.9 uH for TXS

models ZC and ZD, 1.1 uH for models

ZY, ZA and ZB

Electromagnetic Susceptibility

To consider:

The converter does not react to EMI pulses.

However the Y capacitors and the interwinding

capacitance of the multilayer board can couple

some common mode noise to the secondary.

Earthing or decoupling the output with large Y

capacitors needs a two stage EMC filter or a

ground line inductor to meet the EMC conducted

noise level B (see EMC specifications).

- The stabilising input capacitor and the capacitors

of the input filters generate an inrush current.

- The blocking capacitor should be able to handle

the input ripple current of the module, which is

much larger than the reflected input ripple (see

measurement set up: figures 20/22).

- The capacitors may resonate with the inductance

of the input filter and the wiring. If this happens,

the resonance will require damping.

-

The EMI measurements have been done with

a one stage input filter according to Figure 44.

ESD pulses were directly discharged into the

TXS pins.

Burst pulses were applied in front of the input

filter.

Performance criterion A denotes normal operation,

no deviation from specification. Performance

criterion B denotes temporary deviation from

specification.

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Base Plate to Motherboard Rth_BP-PCB

Thermal Considerations

TXS converters provide an efficient way to

transport heat to the motherboard over the pins

and the case. Since the efficiency of this method

varies from design to design, it can’t be predicted.

(See report: “TXS layout considerations”)

TXS converters achieve one of the highest current

and power densities on the market. This would be

useless, if in practise the available current should

be reduced a lot because of cooling problems.

But TXS converters achieve also the highest full

load efficiency on the market and use a unique

thermal design which makes them to real high

density, high current converters.

Base Plate to Ambient Rth_BP-A

TXS modules are designed for forced convection

cooling. To estimate the thermal resistance at

different airflows the following graph can be used:

Maximum Base Plate Temperature

To ensure reliable long term operation, and to

comply with safety agency requirements, the base

plate temperature (T_BP) should always be kept

below 100 °C. The maximum base plate

temperature is defined by two conditions:

Thermal Resistance v's Air-Flow Rate

3.00

2.50

2.00

1.50

1.00

0.50

0.00

•

Maximum multilayer temperature ≤ 120 °C.

(UL 130 °C print material is used: Power-One

designs use normally 10 K safety margin).

Maximum opto-coupler temperature ≤ 100 °C.

(Device limits, otherwise accelerated aging)

•

If the base plate temperature stays below 100 °C,

both of the above limits are kept under all

operating and cooling conditions.

50

100

150

200

250

300

350

400

450

500

550

Air-Flow Rate (LFM)

The maximum base plate temperature is limited by

the temperature protection, but should be verified

after system integration. T_BPcan be measured on

the temperature measuring point on the base

plate. See mechanical drawing for location.

Without Heat Sink

13mm (0.51'') Heat Sink (CUT)

11.4mm (0.45'') Heat Sink

6.1mm (0.24'') Heat Sink

24.1mm (0.95'') Heat Sink

Figure 53: Thermal resistances at laminar airflow

TXS modules are designed to work without

additional heat sink. But it is possible to attach an

external heat sink to the base plate.

Thermal Resistance

Heat sinks can efficiently help to increase the

thermal safety margin or to increase the available

power if the available airflow in a system is not

sufficient.

To operate the converters below the maximum

base plate temperature, sufficient cooling should

be provided. The modules can be cooled by

conduction, convection and radiation to the

surrounding environment.

Calculation of the Required Airflow

The path for the heat transport can be described

The thermal resistance Rth_BP-Aallows determining

the required airflow or heat sink, for a given

ambient temperature and operating condition.

with

a thermal resistance. A low thermal

resistance allows a lot of heat or loss to flow from a

hot component x to the surrounding y.

1

2

The operating conditions define the loss of the

converter: Loss figures for different output

voltages, input voltage ranges, and output

currents can be found on page 8. They should

be corrected with the factors of Table 7 for the

targeted base plate temperature.

Rth_xy= (T_x- T_y) / P_Loss[K/W]

The thermal resistance between x and y is defined

as temperature difference between the two parts,

divided through the amount of loss flowing from the

hot to the cool part (see report “Thermal

performace of TXS” on the TXS product CD ROM

for further information).

TXS provide two main ways for heat transport:

Heat can be transported to the motherboard and to

ambient.

The required thermal resistance for a given

environment (T_BP, T_A) and loss can be

calculated using the formula from above:

Rth_BP-A= (T_BP-T_A) / P_Loss. To remember: The

base plate temperature should not be

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

80

selected above 100 °C. It can be convenient

to use a base plate temperature below 100 °C

in order to optimise the expected lifetime.

TXS100ZY

TXS100ZA

TXS100ZB TXS100ZD

70

60

50

40

30

20

36..60V

36..75V

3

The value of Rth_BP-Aallows to determine the

required airflow or heat sink using Figure 53.

Derating

A “Derating” is the reduction of the available output

power at high ambient temperature. A derating

keeps the maximum temperatures of the unit

below safety critical limits.

airflow [LFM]

Figure 54: Maximum ambient temperature for

different TXS models at different

airflows at 100 A output current and

T_BP=100 °C.

To decide how much the converter can be loaded,

some system parameters need to be known:

•

Maximum ambient temperature and minimum

airflow at the converter

90

TXS100ZY

TXS100ZA

TXS100ZB TXS100ZD

Height / space restrictions for an additional

heat sink

80

70

60

50

40

30

36..60V

36..75V

Layout situation (maximum current density,

neighboring heat sources, shadowing effects,

cooling to the board...)

•

Supply voltage and maximum output current

(average and peak)

•

Least favorable input voltage

Reliability target

airflow [LFM]

TXS derating curves were defined for converters

without heat sinks operating at constant base plate

temperatures of 100 °C !

Figure 55: Maximum ambient temperature for

different TXS models at different

airflows at 80 A output current and

T_BP= 100 °C

Derating Curves

The derating curves allow a first rough estimation if

How to calculate the derating in situations where a

converter should operate at a lower base plate

temperature or when additional heat sinks can be

used?

a

design work. More detailed curves and

explanations can be found in the report “thermal

performance of TXS units” on the product CD

ROM. A second report “Next generation TXS

modules” shows preliminary data of optimised TXS

modules.

1 The thermal resistance for a given airflow and

heat sink can be found in figure 53

The derating data in the figures 54 and 55 shows

two bars for each airflow value. The first bar can

be used for 48 V battery types, where the input

voltage stays within 36 V to 60 V. The second bar

should be used for 60 V battery types, where the

continuous input voltage can be as high as 75 V.

2 The basic formula of the thermal resistance

Rth_BP-A= (T_BP-T_A) / P_Lossallows to determine

the loss at this cooling condition: P_Loss= (T_BP

-

T_A) / Rth_BP-A

3 Normalise the loss figure to the operating

ambient temperature using the correction factor

of table 7. P_{loss 25°C}= P_{loss TBP}/ K

4 With the loss value at 25°C it is possible to

determine the maximum output current of the

converter using the loss figures on page 8.

At 75 V, TXS converters have increased loss

compared to the 36 V to 60 V input range. Thus

the maximum allowed ambient temperature for the

full input range is reduced.

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

The converter itself does not set the derating as for

Alternatively to this standardised calculation

methods, some companies use models based on

experience, returns and field data. This makes it

very difficult to compare reliability data from

different manufacturers. Especially if models from

the MIL-HDBK are used for components with good

reliability data only, and “in house” models for all

the others.

example the output current limit. It is the

responsibility of the end user to decide how much

current/power can be drawn in his design or how

much airflow is required, in order to ensure reliable

operation in the field.

Calculator

Instead of using the graphs, the required airflow or

the allowed output current can be calculated with a

automated, easy to use tool on the TXS Product

CD ROM. The tool uses interpolation between

values and also gives a prediction of the expected

life time for the chosen operating condition. 120A

units are not jet included.

MIL HDBK 217F Notice 2

There is an ongoing discussion about the best

suited method for reliability prediction.

The MIL-HDBK is the most elaborate, well

documented and most widely used tool for

predicting the component reliability. MIL models

are better suited to describing the component

loading in high density converters, than other

models. Belcore models for example were

developed for predicting the reliability of standard

telecom equipment, working at much lower

operating temperatures.

The problem with the MIL HDBK is, that the

models are often based on old data, neglecting

component improvements achieved in the market.

This leads to pessimistic results. Bad prediction

results, related design restrictions and resulting

higher product costs were the main reasons why

the US government recently cancelled the use of

the MIL-HDBK 217 in army specifications.

Important Reminder

Calculations and graphs only give a rough

guide to the required cooling. The specific card

and rack design can vary a lot, which makes it

almost impossible to predict the exact

temperatures of a Brick.

It is good practice to verify the thermal

performance in worst case operating conditions

with all obstructions in place at highest ambient

temperature before the card design is finished.

Reliability

For power supplies however there is no real

alternative for predicting reliability in sight.

Because it is easy to use and has models for all

components included, the MIL-HDBK-217 is still

the best method to get a quantitative measure of

the reliability.

The reliability of TXS converters was verified using

the MIL-HDBK and the Physics of failure approach.

Reliability Prediction

Reliability prediction is a calculation method, based

on the analysis of component failure rates of a

product or a system, with the target to predict the

rate at which the product will fail. It also pinpoints

areas for potential reliability improvements.

Physics of failure (PoF)

Because of the limitations of reliability prediction,

PoF is used as a second tool for a qualitative

measure of the reliability.

A reliability prediction gives not an exact value

for an individual module, but a statistical

estimate for an equipment population in the

field.

The basis of the analysis is a general reliability

prediction model, which describes how the

components react to electrical, thermal and

mechanical stress.

The Physics of failure approach defines a set of

specific screening and stress tests to detect

possible failure mechanism, to analyse the stress

response of the modules and verify their safety

margins.

The TXS CD ROM contains the results from a

“Design Maturity” and a “Design Integrity” test as a

part of the PoF analysis.

There are several calculation models available:

•

MIL-HDBK 217-F Notice 2

Belcore TR-332

PRISM

Background information about reliability prediction

and detection methods, the assumptions for the

calculation with the MIL HDBK and detailed results

can be found in the “reliability report for TXS DC-

DC Converters” on the TXS product CD ROM.

CNET RDF

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Layout Considerations

The layout for a TXS module has to be done

carefully to minimise EMI effects and to avoid

current crowding on the motherboard.

The application note “TXS layout considerations”

on the TXS product CD ROM gives some general

rules how to achieve a good layout. It explains how

to work with 100A currents, how EMI is avoided,

how signal wires should be routed and how the

module should be positioned. It gives safety advice

and describes the advantages of Bus Bars.

Screw fixing

To relieve the solder connections from mechanical

stress, it is recommended that the modules be

screwed to the motherboard. This is especially

important, if an external heatsink is used.

P1 standard Heat Sink

M3

Screw

Thermal

interface material

Alu base-plate

of TXS

0.5’ =12.7mm

Telecom

motherboard

d _Print+/- Tol

Spring washer

Figure 56: Screw fixing of the TXS converter

Care should be taken when selecting the screw

lengths to mount the TXS on the motherboard and

the heatsink on the TXS. The available thread

length in the TXS case and the tolerances of the

screws and the board should be considered.

The minimum insertion depth of the screw in the

material should be 4.5 mm. It is recommend to use

spring washers to compensate for changes in the

motherboard thickness due to ageing and

temperature variations.

REV. FEB 18, 2003

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Product Specification

TXS Series: 75…120 A DC-DC Converters

36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W

Mechanical Drawings

Print mountable industry standard ¾ brick (2.4 x 3.45 x 0.5 inch³)

Converter weight: 150 g; Aluminium case (base plate) with metal mounting posts.

Measurement point for

case temperature T_c

Thermal Impedance

1

2

3

4

5

6

7

Function

V_i-

∅ inch (mm)

(Base plate to ambient)

0.08 ± 0.002

(2.03 ± 0.05)

V_i+

100 LFM

2.75 K/W

2.16 K/W

1.74 K/W

1.38 K/W

ON/OFF

Sense+

V_o-

V_o+

Trim

200 LFM

300 LFM

400 LFM

0.04 ± 0.002

(1.02 ± 0.05)

4x 0.085 ± 0.002

(4x 2.16 ± 0.05)

Note: Thermal impedance data is dependent on

many environmental factors. The exact thermal

performance should be validated for each specific

0.04 ± 0.002

(1.02 ± 0.05)

application. The figure is for

a stand-alone

8

Sense -

module. The thermal impedance was measured

with laminar airflow at 500 m over sea level.

Ordering Information

Available types, options and accessories: see tables on page 2. The sequence of options in the part number

should be set according to their position in the option table, eg: - NP2R1H

TXS [output current] Z [Code Output voltage] — [Code Option(s)]

Example:

TXS100ZB-NP2R1H

TXS with 1.8 V/100 A output, inverted logic shut down, long pins, wide trim and a 0.24” horizontal heat sink.

Notes

1. Power-One products are not authorized for use as critical components in life support systems, equipment used in hazardous

environments, or nuclear control systems without the express written consent of the President of Power-One, Inc.

2. Specifications are subject to change without notice.

REV. FEB 18, 2003

27 of 27

www.power-one.com

厂商	型号	描述	页数
TI	TXS0101	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DBVR	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DBVRG4	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DBVT	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DBVTG4	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DCKR	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DCKRG4	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DCKT	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DCKTG4	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页
TI	TXS0101DRLR	1位双向电压电平转换为漏极开路应用[ 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS ]	18 页