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 1.5 Vdc - 12 Vdc / 22 A - 5 A Outputs, 1/16 Brick

Apr. 12, 2010

Bel Power Inc., a subsidiary of Bel Fuse Inc.

Output Trim Equations

Equations for calculating the trim resistor are shown below (Unit: kΩ). 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.

Note

:

Vo_req=Desired (trimmed) output voltage [V]

Vo=1.503 V for 1.5 V output; Vo=1.804 V for 1.8 V output; Vo=2.505 V for 2.5 V output; Vo=3.308 V for 3.3 V

output; Vo=5.002 V for 5 V output; Vo=12.007 V for 12 V output.

Efficiency Data

50%

55%

60%

65%

70%

75%

80%

85%

90%

2.2A

5.5A

11A

16A

22A

OUTPUT CURRENT (A)

36 V

48 V

75 V

50%

55%

60%

65%

70%

75%

80%

85%

90%

2A

5A

10A

15A

20A

OUTPUT CURRENT (A)

36V

48V

75V

Vo=1.5 V

Vo=1.8 V

22

.

10

511 −

=

delta

()

[]

%

100

_

×

−

=

Vo

Vo

req

Vo

delta

22

.

10

225

.

1

626

11

.

5

)

100

(

−

⋅

−

⋅

⋅

+

=

delta

Vo

delta

R

trimup

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup