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

2

ISOLATED DC/DC CONVERTERS

36 Vdc - 75 Vdc Input,

3.3 Vdc/25 A Output

Sep. 22, 2009

Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.

Absolute Maximum Ratings

Parameter

Min

Typ

Max

Unit

Notes

Continuous non-operating Input

Voltage

-0.3

-

75

V

Input Transient Voltage

-

-

100

V

100mS 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

36

48

75

V

Input Current (full load)

-

-

2.56

A

Input Current (no load)

-

50

100

mA

Remote Off Input Current

-

10

15

mA

Input Reflected Ripple Current

(rms)

-

2

5

mA

Input Reflected Ripple Current

(pk-pk)

-

20

40

mA

With simulated source impedance of

10uH, 5Hz to 20MHz. Use a

100uF/100V electrolytic capacitor with

ESR=1 ohm max, at 200KHz@25°C.

I

-

-

1

A

Turn-on Voltage Threshold

32

34

35

V

Turn-off Voltage Threshold

30

32

34

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 3.5A on system board. Refer to the fuse

manufacture’s datasheet for further information.

Notes: 1. This converter has internal C-L-C (0.47uF-2.2uH-3.2uF) filter.

2. All specifications are typical at 25

°C unless otherwise stated.

Output Specifications

Parameter

Min

Typ

Max

Unit

Notes

Output Voltage Set Point

3.25

3.3

3.35

V

Vin=48V, Io=50% load

Load Regulation

-

0.2

0.5

% Vo,set

Vin=48V, Io=0~100% load

Line Regulation

-

0.2

0.5

% Vo,set

Vin=36~75V,Io=100% load

Regulation Over Temperature

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

-

-

0.02

% Vo,set/C

Ripple and Noise (pk-pk)

-

90

120

mV

Ripple and Noise (rms)

-

25

40

mV

Vin=48V, Io=100%load at 25oC

ambient, 0-20MHz BW, with a

1µF ceramic capacitor and a

10uF Tantalum cap at output.

Ripple and Noise (pk-pk)

under worst case

-

-

160

mV

over all operating input voltage,

load and ambient temperature

condition