nd12s0a0v40pnfa Delta Electronics, Inc., nd12s0a0v40pnfa Datasheet - Page 7

• Manufacturer Part Number: nd12s0a0v40pnfa
• Description: Delphi Nd Series Non-isolated Point Of Load Dc/dc Modules 8.0v~13.8vin, 0.9v~5.0vout, 40a
• Manufacturer: Delta Electronics, Inc.

DESIGN CONSIDERATIONS
The ND 40A uses two phase and peak current mode
controlled buck topology. The output can be trimmed in
the range of 0.9Vdc to 5.0Vdc by a resistor between
Trim+ pin and Trim
The module can be turned ON/OFF by remote control
with positive on/off logic to ENABLE pin. The converter
DC output is disabled when the signal is driven low
(below 0.44V).
The module can protect itself by entering hiccup mode
against over current, short circuit, over voltage condition.
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
maximum 40A or two paralleled 20A of fast-acting
fuses in the ungrounded lead.
DS_ND40A_08072008
－
pin.
FEATURES DESCRIPTIONS
Enable On/Off
The module can be turned ON/OFF by remote control
with positive on/off logic to ENABLE pin.
For positive logic module, the On/Off pin is pulled high
with an external pull-up resistor, R
Positive logic On/Off signal turns the module ON during
logic high and turns the module OFF during logic low. If
the positive On/Off function is not used, connect
ENABLE pin to Vin with R
R
Fig. 25. Positive remote On/Off implementation
Over-Current Protection
To provide protection in an output over load fault
condition,
over-current
protection is triggered, the unit enters hiccup mode.
The units operate normally once the fault condition is
removed.
Over-Temperature Protection
ND40 converter does not have built-in over-temperature
protection. Hence, to ensure proper, reliable operation,
sufficient cooling of the power module is needed over
the entire temperature range of the module. Please refer
page.9 for detail information.
pull-up
Rpull-up
of 100kohm is recommended.
I
ON/OFF
the
protection.
On/Off
Vin
GND
unit
Vo
is
pull-up
When
equipped
RL
. (The module will be On)
pull-up
the
, (see figure 25)
with
over-current
internal
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