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

3.0 V-5.5 V Input

1.0 V-3.3 V/12 A Output

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

3.3

161.391

161.900

43.330

100.000

2.5

111.674

208.900

43.330

147.000

1.8

68.576

287.900

43.330

226.000

1.5

50.000

287.900

43.330

226.000

1.2

31.240

208.900

43.330

147.000

1.0

18.850

161.900

43.330

100.000

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup