D12S05020-1A Datasheet, PDF (7/12 Pages) Delta Electronics, Inc. – Non-Isolated Point of Load DC/DC Modules: 4.5V~13.2Vin, 0.59V~5.0Vout, 20A

DESIGN CONSIDERATIONS
The D12S05020 series uses a single phase and voltage
mode controlled buck topology. The output can be
adjusted in the range of 0.59Vdc to 5.0Vdc by a resistor
from Trim pin to ground.
The converter can be turned ON/OFF by remote control
with positive on/off (ENABLE pin) logic. The converter
DC output is disabled when the signal is driven low
(below 0.8V). The module will turn on when this pin is
floating and the input voltage is higher than the
threshold.
The converter can protect itself by entering hiccup mode
against over current, short circuit, and over voltage
condition.
Safety Considerations
It is recommended that the user to provide a very
fast-acting type fuse in the input line for safety. The
output voltage set-point and the output current in the
application could define the amperage rating of the fuse.
FEATURES DESCRIPTIONS
Enable (On/Off)
The ENABLE (on/off) input allows external circuitry to
put the D12S05020 series converter into a low power
dissipation (sleep) mode. Positive ENABLE is available
as standard. With the active high function, the output is
guaranteed to turn on if the ENABLE pin is driven above
1.2V. The output will turn off if the ENABLE pin voltage is
pulled below 0.8V.
The ENABLE input can be driven in a variety of way as
shown in Figures 25.
Unit
Vin
Enable
Vout
Trim
GND
GND
Figure 25. Enable Input drive circuit for D12S05020
Input Under-Voltage Lockout
The input under-voltage lockout prevents the converter
from being damaged while operating when the input
voltage is too low. The lockout occurs between 4.0V to
4.3V.
Output Capacitance
The D12S05020 requires minimum 1300uF output capacitor
for stable operation.
Power Good
The converter provides an open collector signal called Power
Good. The converter will sink less than 1uA as a logic high
and sink at least 1mA as a logic low. A logic low must be less
than 0.4V while sinking 1mA.
The power good signal is pulled low when an input under
voltage, output over voltage or output over current conditions
is detected or when the converter is disabled by ENABLE.
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