FEATURES DESCRIPTIONS
DESIGN CONSIDERATIONS (CON.)
Remote On/Off
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the module. An
input capacitance must be placed close to the modules
input pins to filter ripple current and ensure module
stability in the presence of inductive traces that supply
the input voltage to the module.
The DNL series power modules have an On/Off pin for
remote On/Off operation. Both positive and negative
On/Off logic options are available in the DNL series
power modules.
For positive logic module, connect an open collector
(NPN) transistor or open drain (N channel) MOSFET
between the On/Off pin and the GND pin (see figure 32).
Positive logic On/Off signal turns the module ON during
the logic high and turns the module OFF during the logic
low. When the positive On/Off function is not used, leave
the pin floating or tie to Vin (module will be On).
Safety Considerations
For safety-agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power module
has extra-low voltage (ELV) outputs when all inputs are
ELV.
For negative logic module, the On/Off pin is pulled high
with an external pull-up resistor (see figure 33) Negative
logic On/Off signal turns the module OFF during logic
high and turns the module ON during logic low. If the
negative On/Off function is not used, leave the pin
floating or tie to GND. (module will be On)
The input to these units is to be provided with a
maximum 15A of glass type fast-acting fuse in the
ungrounded lead.
Vin
Vo
ION/OFF
RL
On/Off
GND
Figure 29: Positive remote On/Off implementation
Vo
Vin
Rpull-up
ION/OFF
RL
On/Off
GND
Figure 30: Negative remote On/Off implementation
Over-Current Protection
To provide protection in an output over load fault
condition, the unit is equipped with internal over-current
protection. When the over-current protection is
triggered, the unit enters hiccup mode. The units
operate normally once the fault condition is removed.
DS_DNL10SMD_07182012
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DELTA [ DELTA ELECTRONICS, INC. ]
