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UZR431LF02TA

型号:

UZR431LF02TA

品牌:

ZETEX[ ZETEX SEMICONDUCTORS ]

页数:

10 页

PDF大小:

400 K

ZR431L  
Adjustable precision shunt regulator  
Summary  
Description  
The ZR431L is a three terminal adjustable shunt regulator offering excellent  
temperature stability and output current handling capability up to 25mA.  
The output voltage may be set to any chosen voltage between 1.24 and  
10 volts by selection of two external divider resistors.  
The devices can be used as a replacement for zener diodes in many  
applications requiring an improvement in zener performance.  
The ZR431L is particularly used in the feedback control loop of switch mode  
power supplies. In this application the device 1.24 volt reference enables  
the generation of low voltage supplies, typically 3.3 volts or 3 volts.  
Features  
2.5% and 1% tolerance  
Max. temperature coefficient 50 ppm/°C  
Temperature compensated for operation over -40 to 85°C  
100mA to 25mA current sink capability  
Surface mount SOT23 package  
Applications  
Switch mode power supplies  
Shunt regulator  
Series regulator  
Voltage monitor  
Over voltage / under voltage protection  
Ordering information  
Device  
Pack  
Part mark  
Status  
Quantity  
per reel  
Reel size  
(inches)  
TOL %  
ZR431LF01TA  
ZR431LF02TA  
ZR431LC01STOB  
ZR431LC02STOB  
ZR431LC01L  
SOT23  
SOT23  
TO92  
TO92  
TO92  
TO92  
43M  
Active  
Active  
3000  
3000  
1500  
1500  
7
7
1
2.5  
1
43L  
ZR431L01  
ZR431L02  
ZR431L01  
ZR431L02  
Obsolete  
Obsolete  
Obsolete  
Obsolete  
2.5  
1
Loose  
Loose  
ZR431LC02L  
2.5  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
1
www.zetex.com  
ZR431L  
Absolute maximum ratings  
Parameter  
Symbol  
Limit  
Unit  
Cathode voltage  
V
10  
V
Z
Cathode current  
50  
mA  
°C  
Storage temperature  
T
-55 to 105  
STG  
Junction temperature  
T
-40 to 125  
°C  
J
Power dissipation (at T  
= 25°C unless otherwise stated)  
amb  
Package  
Value  
Unit  
SOT23  
330  
mW  
Recommended operating conditions  
Parameter  
Min.  
Max.  
Cathode voltage  
V
10V  
REF  
Cathode current  
100A  
25mA  
85°C  
Operating temperature  
-40°C  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
2
www.zetex.com  
ZR431L  
Block diagram  
Deviation of reference input voltage, V , is defined as  
dev  
the maximum variation of the reference input voltage  
over the full temperature range.  
The average temperature coefficient of the reference  
input voltage, V  
is defined as:  
ref  
Vdevx1000000  
Vref (T1T2)  
Vref(ppmIC) =  
The dynamic output impedance, R , is defined as:  
z
ΔVZ  
ΔIZ  
RZ  
=
When the device is programmed with two external  
resistors, R1 and R2, (fig 2), the dynamic output  
impedance of the overall circuit, R’, is defined as:  
R1  
R'= RZ (1+  
)
R2  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
3
www.zetex.com  
ZR431L  
Electrical characteristics (at T  
= 25°C unless otherwise stated)  
amb  
Parameter  
Reference Voltage 2.5% V  
Symbol Min.  
Typ.  
1.24  
1.24  
Max.  
1.271  
1.252  
Unit Conditions  
1.209  
1.228  
V
V
I = 10mA (Fig1), V = V  
L Z ref  
ref  
1.0%  
V
ref  
Deviation of Reference  
Input Voltage over  
Temperature  
V
4.0  
8.0  
mV I = 10mA, V = V  
L Z ref  
dev  
T = full range (Fig 1)  
a
Ratio of the change in  
Reference Voltage to the  
change in Cathode  
Voltage)  
0.5  
2.0  
mV/V V from V to 10V  
Z ref  
ΔV  
ref  
I = 10mA (Fig2)  
Z
ΔVZ  
Reference Input Current  
I
0.02  
0.11  
0.02  
0.4  
0.2  
A  
A  
R1 = 10k, R2 = O/C,  
L
ref  
l = 10mA (fig2)  
Deviation of Reference  
Input Current over  
Temperature  
I  
R1 = 10k, R2 = O/C,  
ref  
I = 10mA T = full  
L
a
range (Fig2)  
Minimum Cathode  
I
I
30  
10  
100  
30  
A  
A  
Zmin  
Zoff  
Current for Regulation  
Off-state Current  
V = 10V, V = 0V  
Z
ref  
(Fig3)  
Dynamic Output  
Impedance  
R
0.25  
2
Ω
V = V (Fig1), f = 0Hz,  
Z ref  
Z
I = 10mA  
L
DC Test circuits  
Fig 1 - Test Circuit for V = V  
Fig 2 - Test Circuit for V > V  
Fig 3 - Test Circuit for Off State  
current  
Z
ref  
Z
ref  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
4
www.zetex.com  
ZR431L  
Typical characteristics  
0
140  
130  
120  
110  
100  
90  
-1  
-2  
-3  
-4  
-5  
-6  
-7  
-8  
-9  
80  
0
2
4
6
8
10  
-40  
-25  
-10  
5
20  
35  
50  
65  
80  
95  
110 125  
Cathode voltage (V)  
Change in reference voltage vs Cathode voltage  
Temperature (°C)  
Reference Current v Temperature  
100  
26  
24  
22  
20  
18  
16  
10  
1
VREF = VKA  
IK = 1mA  
I
K = 10mA  
0.1  
0.1  
1
10  
100  
-40  
-25  
-10  
5
20  
35  
50  
65  
80  
95  
110 125  
Frequency (kHz)  
Dynamic impedance vs frequency  
Temperature (°C)  
Minimum cathode current vs temperature  
1.244  
350  
300  
250  
200  
150  
100  
50  
1.242  
1.24  
1.238  
1.236  
1.234  
1.232  
-40 -25 -10  
-5  
20  
35  
50  
65  
80  
95 110 125  
-42  
-25  
-10  
5
20  
35  
50  
65  
80  
95  
110 125  
Ambient temperature (°C)  
Power dissipation derating  
Temperature (°C)  
Reference voltage vs Temperature  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
5
www.zetex.com  
ZR431L  
Application circuits  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
6
www.zetex.com  
ZR431L  
Typical characteristics  
60  
50  
40  
30  
20  
10  
0
0
1
10  
100  
Frequency (kHz)  
Open loop gain vs frequency  
2
1
0
Repetitive  
pulse  
VKA  
Single  
pulse  
5
2.5  
0
VIN  
-2.5  
0
50 100 150 200 250 300 350 400 450 500  
Time (μs)  
Pulse response  
30  
25  
20  
15  
10  
5
0
0.01  
0.1  
1
10  
100  
1000  
10000  
Load capacitance (nF)  
Stability boundary conditions  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
7
www.zetex.com  
ZR431L  
SOT23 Package outline and pad layout details  
E
0.95  
0.037  
e
e1  
b
3 leads  
2.0  
0.079  
0.9  
0.035  
D
L1  
E1  
mm  
inches  
0.8  
0.031  
A
L
c
A1  
Dim.  
Millimeters  
Min. Max.  
Inches  
Min.  
Dim.  
Millimeters  
Inches  
Max.  
0.044  
0.004  
0.020  
0.008  
0.120  
Min.  
Max.  
Min.  
Max.  
A
-
1.12  
0.10  
0.50  
0.20  
3.04  
-
e1  
E
1.90 NOM  
0.075 NOM  
A1  
b
0.01  
0.30  
0.085  
2.80  
0.0004  
0.012  
0.003  
0.110  
2.10  
1.20  
0.25  
0.45  
-
2.64  
1.40  
0.60  
0.62  
-
0.083  
0.047  
0.104  
0.055  
E1  
L
c
0.0098 0.0236  
D
e
L1  
-
0.018  
-
0.024  
-
0.95 NOM  
0.037 NOM  
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches.  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
8
www.zetex.com  
ZR431L  
TO92 Package outline  
VZ  
GND  
Vref  
1
2
3
Underside view  
Dim.  
Millimeters  
Inches  
Min.  
Max.  
4.95  
0.51  
3.94  
2.67  
1.40  
15.49  
2.41  
1.52  
0.56  
4.95  
6°  
Min.  
Max.  
0.195  
0.020  
0.155  
0.105  
0.055  
0.610  
0.095  
0.060  
0.022  
0.195  
6°  
A
b
4.32  
0.36  
3.30  
2.41  
1.14  
12.70  
2.16  
1.14  
0.41  
4.45  
4°  
0.170  
0.014  
0.130  
0.095  
0.045  
0.500  
0.085  
0.045  
0.016  
0.175  
4°  
E
e
e1  
L
R
S1  
W
D
*°  
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
9
www.zetex.com  
ZR431L  
Definitions  
Product change  
Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or  
service. Customers are solely responsible for obtaining the latest relevant information before placing orders.  
Applications disclaimer  
The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for  
the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is  
assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights  
arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract,  
tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract,  
opportunity or consequential loss in the use of these circuit applications, under any circumstances.  
Life support  
Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written  
approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein:  
A. Life support devices or systems are devices or systems which:  
1. are intended to implant into the body  
or  
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the  
labeling can be reasonably expected to result in significant injury to the user.  
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to  
cause the failure of the life support device or to affect its safety or effectiveness.  
Reproduction  
The product specifications contained in this publication are issued to provide outline information only which (unless agreed by the  
company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a  
representation relating to the products or services concerned.  
Terms and Conditions  
All products are sold subjects to Zetex’ terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two  
when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement.  
For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office.  
Quality of product  
Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer.  
To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our  
regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork  
Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels.  
ESD (Electrostatic discharge)  
Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices.  
The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent  
of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time.  
Devices suspected of being affected should be replaced.  
Green compliance  
Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding reg-  
ulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce  
the use of hazardous substances and/or emissions.  
All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with  
WEEE and ELV directives.  
Product status key:  
“Preview”  
“Active”  
Future device intended for production at some point. Samples may be available  
Product status recommended for new designs  
“Last time buy (LTB)”  
Device will be discontinued and last time buy period and delivery is in effect  
“Not recommended for new designs” Device is still in production to support existing designs and production  
“Obsolete”  
Production has been discontinued  
Datasheet status key:  
“Draft version”  
This term denotes a very early datasheet version and contains highly provisional information, which  
may change in any manner without notice.  
“Provisional version”  
“Issue”  
This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance.  
However, changes to the test conditions and specifications may occur, at any time and without notice.  
This term denotes an issued datasheet containing finalized specifications. However, changes to  
specifications may occur, at any time and without notice.  
Zetex sales offices  
Europe  
Americas  
Asia Pacific  
Corporate Headquarters  
Zetex GmbH  
Kustermann-park  
Balanstraße 59  
D-81541 München  
Germany  
Zetex Inc  
Zetex (Asia Ltd)  
Zetex Semiconductors plc  
Zetex Technology Park, Chadderton  
Oldham, OL9 9LL  
700 Veterans Memorial Highway  
Hauppauge, NY 11788  
USA  
3701-04 Metroplaza Tower 1  
Hing Fong Road, Kwai Fong  
Hong Kong  
United Kingdom  
Telefon: (49) 89 45 49 49 0  
Fax: (49) 89 45 49 49 49  
europe.sales@zetex.com  
Telephone: (1) 631 360 2222  
Fax: (1) 631 360 8222  
usa.sales@zetex.com  
Telephone: (852) 26100 611  
Fax: (852) 24250 494  
asia.sales@zetex.com  
Telephone: (44) 161 622 4444  
Fax: (44) 161 622 4446  
hq@zetex.com  
© 2008 Published by Zetex Semiconductors plc  
Issue 3 - April 2008  
© Zetex Semiconductors plc 2008  
10  
www.zetex.com  
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