13

Jul. 13, 2015

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

NON-ISOLATED DC/DC CONVERTERS

3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /6 A Outputs

Feature Descriptions

Remote On/Off

Parameter

Min

Typ

Max

Unit

Notes

Signal Low (Unit On)

Active Low

-0.2

-

0.4

V

The remote on/off pin open, Unit on.

Signal High (Unit Off)

3.0

-

V

Signal Low (Unit Off)

Active High

-0.2

-

0.3

V

The remote on/off pin open, Unit on.

Signal High (Unit On)

3.0

-

V

The SLAN-06D2Ax power modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options

are available. In the Positive Logic On/Off option, (device code suffix “0” – see Ordering Information), the module

turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic

On/Off option, (device code suffix “L” – see Ordering Information), the module turns OFF during logic High and

ON during logic Low. The On/Off signal should be always referenced to ground. For either On/Off logic option,

leaving the On/Off pin disconnected will turn the module ON when input voltage is present.

For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 39. When the

external transistor Q1 is in the OFF state, the internal PWM Enable signal is pulled high through an internal

resistor and the external pullup resistor and the module is ON. When transistor Q1 is turned ON, the On/Off pin is

Figure 39

Circuit configuration for using positive On/Off logic.

For negative logic On/Off modules, the circuit configuration is shown in Fig. 40. The On/Off pin should be pulled

high with an external pull-up resistor (suggested value for the 3V to 14.4V input range is 20Kohms). When

transistor Q1 is in the OFF state, the On/Off pin is pulled high, internal transistor Q4 is turned ON and the module

is OFF. To turn the module ON, Q1 is turned ON pulling the On/Off pin low, turning transistor Q4 OFF resulting in

the PWM Enable pin going high and the module turning ON

.

Figure 40

Circuit configuration for using negative On/Off logic.

Rpullup

+

Q4

GND

Q2

22K

+VIN

V

VIN

ENABLE

ON/OFF

30K

0.047uF

30K

22K

MODULE

_

22K

22K

ON/OFF

Q3

I