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

8

ISOLATED DC/DC CONVERTERS

36 Vdc - 75 Vdc Input, 15 Vdc/5 A Output

Aug. 22, 2011

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

Over Current Protection

To provide protection in a fault output overload condition, the module is equipped with internal current-limiting

circuitry and can endure current limiting for a few mili-seconds. If the overcurrent condition persists beyond a few

milliseconds, the module will shut down into hiccup mode and restart once every 500mS. The module operates

normally when the output current goes into specified range. The typical average output current is 215mA during

hiccup.

Over Voltage Protection

The output overvoltage protection consists of circuitry that monitors the voltage on the output terminals. If the

voltage on the output terminals exceeds the over voltage protection threshold, the module will shutdown.

Test setup:

Waveform: CH1: Output voltage waveform

Vin=48V

Expansion of on time portion of above figure

CH4: Output current waveform

Vo+

Vo-

Trim

R

K

Sense+

Sense-

Trim

R

K