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

2

ISOLATED DC/DC CONVERTERS

18 Vdc - 75 Vdc Input, 12 Vdc/3.5 A Output

Apr. 19, 2011

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

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

18

48

75

V

Input Current (full load)

-

-

3.5

A

Input Current (no load)

-

60

120

mA

Remote Off Input Current

-

1

3

mA

Input Reflected Ripple Current

(rms)

-

3

7

mA

Input Reflected Ripple Current

(pk-pk)

-

20

50

mA

With simulated source impedance of

15uH, 5Hz to 20MHz. Use a

100uF/100V electrolytic capacitor with

ESR=1 ohm max, at 200KHz@25°C.

I

-

0.01

0.02

A

Input Over Voltage Lockout

78

-

82

V

Turn-on Voltage Threshold

16.6

17.2

17.8

V

Turn-off Voltage Threshold

16.2

16.8

17.4

V

Note: All specifications are typical at 25

C unless otherwise stated.

Output Specifications

Parameter

Min

Typ

Max

Unit

Notes

Output Voltage Set Point

11.75

12

12.25

V

Vin=48V, Io=50% load

Load Regulation

-

±9

±18

mV

Line Regulation

-

±6

±15

mV

Regulation Over Temperature

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

-

±20

±35

mV

Output Ripple and Noise (pk-pk)

-

90

180

mV

Output Ripple and Noise (rms)

-

30

55

mV

0-20MHz BW, with a 1µF

ceramic capacitor and a 10uF

Tantalum cap at output.

Output Current Range

0

-

3.5

A

Output DC Current Limit

3.7

5

6

A

Short Circuit Surge Transien

-

0.5

1

A

Hiccup mode, auto recovery

Turn on Time

-

25

50

mS