D12S05020-1E datasheet(7/12 Pages) DELTA

Part #	D12S05020-1E

Description	4.5V~13.2Vin, 0.59V~5.0Vout, 20A

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Manufacturer	DELTA [Delta Electronics, Inc.]

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DS_D12S05020_10282008

7

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

Vout

Enable

Trim

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.

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.

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