SLIN-03F1A Datasheet, PDF (14/27 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /3 A Outputs
December 9, 2010
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Remote On/Off
Parameter
Min
Typ
Max Unit
Notes
Signal Low (Unit On)
-0.2
-
Vin-1.6
V
Active Low
The remote on/off pin open, Unit on.
Signal High (Unit Off)
Vin-0.8
-
Vin,max V
Signal Low (Unit Off)
-0.3
Active High
Signal High (Unit On)
1.2
-
0.3
V
The remote on/off pin open, Unit on.
-
Vin,max V
The SLIN-03F1Ax 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, 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, the module turns OFF during logic High
and ON during logic Low. The On/Off signal is 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 the figure below. When
the external transistor Q1 is in the OFF state, Q2 is ON, the internal PWM Enable signal is pulled low and the
module is ON. When transistor Q1 is turned ON, the On/Off pin is pulled low, Q2 is turned off and the internal
PWM Enable signal is pulled high through the 100K internal pull-up resistor and the module is OFF.
VIN+
MODULE
100K
20K
I _ON/OFF
ON/OFF ₊
PWM Enable
Q2
Q1
V_ON/OFF
20K
_
GND
Circuit configuration for using positive On/Off logic
For negative logic On/Off modules, the circuit configuration is shown below. The On/Off pin should be pulled
high with an external pull-up resistor (suggested value for the 2.4V to 5.5V input range is 3.6Kohms). When
transistor Q1 is in the OFF state, the On/Off pin is pulled high and the module is OFF. The On/Off threshold for
logic High on the On/Off pin depends on the input voltage and its minimum value is V_IN – 1.6V. To turn the
module ON, Q1 is turned ON pulling the On/Off pin low.
VIN+
MODULE
Rpullup
100K
ON/OFF
I _ON/OFF
+
V_ON/OFF
Q1
2.05K PWM Enable
20K
GND
_
Circuit configuration for using negative On/Off logic
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com
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