ISOLATED DC/DC CONVERTERS
18 Vdc - 75 Vdc Input 3.3 Vdc /20 A Output, 1/8 Brick
Nov. 16, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Absolute Maximum Ratings
Unit
V
Parameter
Min
-0.3
-
Typ
Max
80
Notes
Continuous Input Voltage
Input Transient Voltage
Remote On/Off
-
-
-
-
-
-
100
18
V
100 mS maximum
-0.3
-
V
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
1500
85
V
-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
18
24/48
75
V
Input Current (full load)
Input Current (no load)
Remote Off Input Current
-
-
-
4.3
65
10
5.0
100
15
A
mA
mA
Tested 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 at 25 °C.
Input Reflected Ripple Current
(rms)
-
-
7
10
50
mA
Input Reflected Ripple Current
(pk-pk)
30
mA
I2t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Input Over Voltage Lockout
-
0.05
16.8
15.8
78
0.1
17.5
16.5
80
A2s
V
16
15
76
V
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 8A on system board. Refer to the fuse
manufacture’s datasheet for further information.
Notes: 1. This converter has internal C-L-C (0.47uF-1.0uH-0.47uF+2.2uF) filter.
2. For recommended external input filter, please refer to Safety section.
3. All specifications are typical at 25 °C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Unit
Notes
Output Voltage Set Point
3.234
3.3
3.366
V
Vin=48V, Io=50% load
Load Regulation
Line Regulation
-
-
±3.3
±3.3
±10
±10
mV
mV
Regulation Over Temperature
(-40deg.C-85deg.C)
-
±10
±33
mV
0-20 MHz BW, with a 1µF ceramic
capacitor and a 10uF Tantalum cap at
output.
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
-
-
50
15
80
25
mV
mV
Ripple and Noise (pk-pk)
under worst case
over all operating input voltage, load
and temperature conditions.
-
-
150
mV
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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