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

48V Input 3.3V/15A, 5V/12A, 12V/5A Output, 1/8 Brick

Output Trim Equations

Equations for calculating the trim resistor (in kΩ) are shown below. The Trim Down resistor should be connected

between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin and the

Vout. Only one of the resistors should be used for any given application.

Notes:

Vo_req=Desired (trimmed) output voltage [V]

Output voltage Vo=3.308V for 3.3V output; Vo=5.002V for 5.0V; Vo=12.007V for 12V output

22

.

10

511 −

=

delta

Rtrimdown

()

[]

%

100

_

×

−

=

Vo

Vo

req

Vo

delta

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup

22

.

10

225

.

1

626

11

.

5

)

100

(

−

⋅

−

⋅

⋅

+

=

delta

Vo

delta

Rtrimup