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

4.5V-13.2V Input

0.9V-5.0V/15A 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

0.9 - 3.63

N/A

N/A

6.008

2.150

5.0

31.574

19.010

6.008

11.50

3.3

18.8157

25.310

6.008

17.800

2.5

12.7927

30.110

6.008

22.600

1.8

7.5426

39.110

6.008

31.600

1.5

5.2865

33.610

6.008

26.100

1.2

3.027

24.410

6.008

16.900

0.9

N/A

N/A

6.008

64.900

Efficiency Data

MODULE 5.0V

70%

75%

80%

85%

90%

95%

100%

1.5

3.75

7.5

11.25

15.0

OUTPUT CURRENT

12V

MODULE 3.3V

70.0%

75.0%

80.0%

85.0%

90.0%

95.0%

100.0%

1.5

3.75

7.5

11.25

15.0

OUTPUT CURRENT

5V

12V

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup