Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

• Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

ISOLATED DC/DC CONVERTERS

48 Vdc Input

3.3 Vdc - 24 Vdc/7 A - 1.25 A Output

Control Specifications

Parameter

Min

Typ

Max

Notes

Remote On/Off

Signal Low (Unit On)

-0.3 V

-

0.8 V

Signal High (Unit Off)

Active Low

3.5 V

-

12 V

Signal Low (Unit Off)

-0.3 V

-

0.8 V

Signal High (Unit On)

Active High

3.5 V

-

12 V

The remote On/Off pin open,

Unit On.

Current Sink

0.3 mA

-

0.75 mA

Output Trim Equations

Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal

output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between

the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of

the resistors should be used for any given application.

B

V

V

A

R

adj

nom

down

trim

−

−

=

_

D

V

V

C

R

nom

adj

up

trim

−

−

=

_

Vnom

A

B

C

D

24.0

272.305

15.664

31.634

3.010

15.0

92.125

9.360

18.400

2.000

12.0

53.320

9.260

14.025

3.650

5.0

19.300

15.120

6.350

10.000

3.3

21.711

40.610

13.032

30.100

Rtrim_down

Module

Vout

GND

Trim

Rtrim_up

Module

Vout

GND

Trim