Datasheet

DS_DCM12S0A0S12NFA_06092014 E-mail: [e-mail]
http://www.deltaww.com/dcdc
P11
DESIGN CONSIDERATIONS (CON.)
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.
The input to these units is to be provided with a fast acting
fuse with a maximum rating of 15A in the positive input
lead.
Input Under voltage Lockout
At input voltages below the input under voltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the under
voltage lockout turn-on threshold.
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.
FEATURES DESCRIPTIONS
Remote On/Off
The DCM 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 DCM 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 40).
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).
For negative logic module, the On/Off pin is pulled high
with an external pull-up 5kΩ resistor (see figure 41).
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)
Vo
O n /O ff
V in
GND
Q1
RL
I
O N /O FF
Figure 40: Positive remote On/Off implementation
Vo
On/Off
Vin
GND
Q1
RL
Rpull-
up
I
ON /OFF
Figure 41: Negative remote On/Off implementation