Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302

2

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

Parameter

Min

Typ

Max

Unit

Notes

Continuous Input Voltage

-0.3

-

80

V

Input Transient Voltage

-

-

100

V

100 mS maximum

Remote On/Off

-0.3

-

18

V

I/O Isolation Voltage

-

-

1500

V

Ambient Temperature

-40

-

85

°C

Storage Temperature

-55

-

125

°C

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)

-

4.3

5.0

A

Input Current (no load)

-

65

100

mA

Remote Off Input Current

-

10

15

mA

Input Reflected Ripple Current

(rms)

-

7

10

mA

Input Reflected Ripple Current

(pk-pk)

-

30

50

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.

I

-

0.05

0.1

A

Turn-on Voltage Threshold

16

16.8

17.5

V

Turn-off Voltage Threshold

15

15.8

16.5

V

Input Over Voltage Lockout

76

78

80

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

-

±3.3

±10

mV

Line Regulation

-

±3.3

±10

mV

Regulation Over Temperature

(-40deg.C-85deg.C)

-

±10

±33

mV

Ripple and Noise (pk-pk)

-

50

80

mV

Ripple and Noise (rms)

-

15

25

mV

0-20 MHz BW, with a 1µF ceramic

capacitor and a 10uF Tantalum cap at

output.

Ripple and Noise (pk-pk)

under worst case

-

-

150

mV

over all operating input voltage, load

and temperature conditions.