Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302

7

ISOLATED DC/DC CONVERTERS

48 Vdc Input 12 Vdc/12 A, 3.3 Vdc/46 A, 5 Vdc/30 A, 1.2-2.5 Vdc/50 A Outputs

May 17, 2011

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

Output Trim Equations (continued)

Trim Voltage Calculate

Equations for calculating the external trim voltage are shown below (Unit: V).

1) For Vo=1.5 V – 12 V:

Note

:

Vo_req=Desired (trimmed) output voltage [V]; Vo=output voltage

Vo=12.006 V for 12 V output; Vo=5.000 V for 5 V output; Vo=3.308 V for 3.3 V output; Vo=2.505 V for 2.5 V

output; Vo=1.804 V for 1.8 V output; Vo=1.503 V for 1.5 V output

2) For Vo=1.2 V:

Note

:

Vo_req=Desired (trimmed) output voltage [V]; Vo=output voltage

Vo=1.202 V for 1.2 V output

]

[

225

.

1

_

45

.

2

V

req

Vo

Vo

Vtrim







Vtrim

Module

Vout

Trim

GND

 

V

req

Vo

Vo

Vtrim

614

.

0

_

226

.

1







Vtrim

Module

Vout

Trim

GND