JF48S15-1000 Datasheet, PDF (5/15 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JF24S15-1000
Remote ON/OFF
Two remote ON/OFF controls are available for the JF Series
Positive logic remote ON/OFF turns the modules on during a logic-high voltage on the remote ON/OFF pin, and
off during logic low. Negative logic remote ON/OFF turns the module off during logic high and on during logic
low or when the remote ON/OFF pin is shorted to the -INPUT pin.
For negative logic remote ON/OFF control add the suffix “R” for DIP type and “SR” for SMT type. For the
positive logic ON/OFF control there is no suffix for DIP type and add the suffix “S” for SMT type.
Ex: JF48S15-1000S
To turn the power module on and off, the user must supply a switch to control the voltage between the ON/OFF
terminal (V_ON/OFF) and the -INPUT. The switch may be an open collector or equivalent (see figure). A logic low
is V_ON/OFF = -0.7V to 1.2V. The maximum I_ON/OFF during a logic low is 1mA. The switch should maintain a
logic-low voltage while sinking 1mA.
During logic high, the maximum V_ON/OFF generated by the power module is 15V. The maximum allowable
leakage current of the switch at V_on/off = 15V is 50uA
The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally
needed and may degrade the start-up characteristics of the module.
The Figure below details five possible circuits for driving the ON/OFF pin.
Figure 3
ON/OFF Control
ON/OFF Control
ON/OFF Control
-INPUT
Remote Enable Circuit
-INPUT
Negative Logic
(Permanently Enabled)
-INPUT
Positive Logic
(Permanently Enabled)
ON/OFF Control
-INPUT
Open Collector Enable Circuit
5V
TTL/
CMOS
ON/OFF Control
-INPUT
Negative Logic
(Permanently Enabled)
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