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

9

NON-ISOLATED DC/DC CONVERTERS

5 Vdc - 13.8 Vdc Input

0.6 Vdc - 5 Vdc/50 A Output

Nov. 02, 2010

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

Control Specifications

Parameter

Min

Typ

Max

Unit

Notes

Remote On/Off (Active High)

Signal Low (Unit Off)

-0.3

-

0.8

V

Signal High (Unit On)

2

-

Vin,max

V

Remote On/Off pin is open, unit is off.

Current Source/Sink

0

-

3.3

mA

Recommended remote on/off circuit for active high

Control with open collector/drain circuit

Control with photocoupler circuit

Control with logic circuit

Permanently on

Output Trim Equations

Equations for calculating the trim resistor are shown below. The Trim Up resistor should be connected between

the Trim+ pin and Trim- pin.

Maximum duty cycle is 65%.

Minimum trim down voltage is 0.6V

Maximum trim up voltage is 5V.

The total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage.

The resistor trim equation:

The voltage trim equation:

1.2

()

0.6

trim

RK

Vo

=Ω

−

Module

Vout

Trim+

Trim–

Rtrim

()

()

1

2

1

1.2 2

()

0.6

1.2

trim

trim

trim

trim

RV

RK

RVo

−

=Ω

−−

Trim+

+

-

Trim-

Rtrim1

Rtrim2

Vin +

Vin-

On/o ff

Vcc

Vin+

Vin-

On/off

Vc c

Vin+

Vin-

On/off

Vin+

Vin-

On/off

Vcc