SLIN-20E1A0 BEL [Bel Fuse Inc.], SLIN-20E1A0 Datasheet - Page 14

• Manufacturer Part Number: SLIN-20E1A0
• Description: NON-ISOLATED DC/DC CONVERTERS 4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
• Manufacturer: BEL [Bel Fuse Inc.]

Remote On/Off
The SLIN-20E1Ax 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 below. When the external
transistor Q1 is in the OFF state, the internal PWM Enable signal is pulled high through an internal 24.9kΩ
resistor and the external pullup resistor and the module is ON. When transistor Q1 is turned ON, the On/Off pin is
pulled low and the module is OFF. A suggested value for R
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 4.5V to 14V input range is 20Kohms). When transistor
Q1 is in the OFF state, the On/Off pin is pulled high, internal transistor Q2 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 Q2 OFF resulting in the
PWM Enable pin going high and the module turning ON.
October 8, 2009
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input, 0.69 Vdc - 5.5 Vdc /20 A Outputs
Parameter
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] •
Active Low
Active High
Circuit configuration for using negative On/Off logic
Circuit configuration for using positive On/Off logic
VIN+
ON/OFF
VIN+
GND
Rpullup
Q1
GND
I
ON/OFF
ON/OFF
V
Vin-1
ON/OFF
Min
2.0
Rpullup1
V
Q1
+
_
0
-
I
ON/OFF
ON/OFF
+
_
MODULE
23K
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Typ
-
-
-
-
MODULE
23K
22K
22K
Q2
pullup
Vin,max
Vin,max
22K
Max
3.5
22K
1
Q2
is 20kΩ.
24.9K
Q3
12.1K
Unit
PWM Enable
V
V
V
V
24.9K
PWM Enable
12.1K
The remote on/off pin open, Unit off.
The remote on/off pin open, Unit on.
Notes
www.belfuse.com
14