ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input, 12 Vdc/33 A Output
May 23, 2011
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Absolute Maximum Ratings
Unit
Parameter
Min
Typ
Max
Notes
Continuous non-operating Input
Voltage
-0.3
-
100
V
Remote On/Off
-0.3
-40
-55
-
-
-
10
85
V
Ambient Temperature
Storage Temperature
C
C
125
Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may
permanently damage the device.
Input Specifications
Parameter
Min
Typ
Max
Unit
Notes
Operating Input Voltage
36
48
75
V
Input Current (full load)
Input Current (no load)
Remote Off Input Current
-
-
-
-
140
4
12
200
8
A
mA
mA
Input Reflected Ripple Current
(rms)
-
-
50
80
-
-
mA
12μH source impedance;
VIN= 48V,Io= Iomax
Input Reflected Ripple Current
(pk-pk)
mA
I2t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
-
-
1
A2s
V
34
32
35
34
36
34.8
V
CAUTION: This converter is not internally fused. An input line fuse must be used in application.
Recommend a fast-acting fuse with maximum rating of 20A on system board. Refer to the fuse
manufacture’s datasheet for further information.
Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Unit
Notes
11.8
12
12.2
V
Vin＞40V, Io=50% load
Output Voltage Set Point
11
-30
-
-
-
-
V
Vin≤40V, TBD
Load Regulation
Line Regulation
30
30
mV
mV
Vin=48V, Io=0~100% load
Vin=40~75V,Io=100% load
20
Output Ripple and Noise (pk-pk)
Output Ripple and Noise (rms)
-
-
100
10
150
20
mV
mV
0-20MHz BW, with a 1µF ceramic
capacitor and a 10uF tantalum at
output.
Ripple and Noise (pk-pk)
under worst case
Over all operating input voltage, load
and ambient temperature condition.
-
-
200
mV
Output Current Range
Output DC Current Limit
Rise time
0
-
-
40
-
33
-
A
A
-
15
mS
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
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