Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

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

NON-ISOLATED DC/DC CONVERTERS

10 Vdc - 14 Vdc Input

1.2 Vdc - 5.0 Vdc/10 A Outputs

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

trimdown

−

−

=

D

V

V

C

R

nom

adj

trimup

−

−

=

Vnom

A

B

C

D

5.0

64.6353

16.01

10.507

1

3.3

39.1049

16.01

10.507

1

2.5

27.0561

16.01

10.507

1

1.8

16.5749

16.01

10.507

1

1.5

12.0693

16.01

10.507

1

1.2

-

-

10.507

1

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup