ISOLATED DC/DC CONVERTERS
36 Vdc - 75 Vdc Input,
12 Vdc/25 A Output
Jun. 14, 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
-
80
V
Remote On/Off
-0.3
-
-
-
-
-
18
2250
85
V
V
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
-40
-55
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
-
-
-
-
10
-
A
90
10
mA
mA
-
Input Reflected Ripple Current
(rms)
With simulated source impedance of
10 uH, 5 Hz to 20 MHz; use a 100
uF/100 V electrolytic capacitor with
ESR = 1 ohm max, at 200 kHz@25°C.
-
-
15
50
-
-
mA
Input Reflected Ripple Current
(pk-pk)
mA
I2t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
-
-
TBD
34.5
34
-
35.5
-
A2s
V
32.5
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 14A 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
Output Voltage Set Point
11.76
12
12.24
V
Vin=48 V, Io=50%Load
Load Regulation
Line Regulation
-
-
±30
±12
±60
±24
mV
mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±60
±100
mV
0 - 20 MHz BW, with 1 uF ceramic
load capacitor and a 10 uF
tantalum capacitor at the output.
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
Output Current Range
Output DC Current Limit
-
-
50
20
-
100
50
mV
mV
A
0
25
26
32
38
A
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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