D12S300-1 Datasheet, PDF (7/13 Pages) Delta Electronics, Inc. – 4.5V~13.8Vin, 0.6V~5.0Vout, 60A

DESIGN CONSIDERATIONS
The D12S300-1 uses a three phase and voltage mode
controlled buck topology. The output can be trimmed in
the range of 0.6Vdc to 5.0Vdc by a resistor from Trim pin
to Ground.
The converter can be turned ON/OFF by remote control.
Positive on/off (ENABLE pin) logic implies that the
converter DC output is enabled when the signal is driven
high (greater than 1.2V) or floating and disabled when
the signal is driven low (below 0.7V). Negative on/off
logic is optional.
The converter provides an open collector Power Good
signal. The power good signal is pulled low when output
is not within ±10% of Vout or Enable is OFF.
The converter can protect itself by entering hiccup mode
against over current and short circuit condition.
Safety Considerations
It is recommended that the user to provide a 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 D12S300-1 converter into a low power
dissipation (sleep) mode. Positive ENABLE is available
as standard.
Positive ENABLE units of the D12S300-1 series are
turned on if the ENABLE pin is high or floating. Pulling
the pin low will turn off the unit. 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 0.7V.
The ENABLE input can be driven in a variety of ways as
shown in Figures 25 and 26. If the ENABLE signal
comes from the primary side of the circuit, the ENABLE
can be driven through either a bipolar signal transistor
(Figure 25). If the enable signal comes from the
secondary side, then an opto-coupler or other isolation
devices must be used to bring the signal across the
voltage isolation (please see Figure 26).
Unit
Vin
Enable
Vout
Trim
GND
GND
Figure 25: Enable Input drive circuit for D12S300-1 series
DS_D12S300-1_12282009
Unit
Vin
Vout
Enable Trim(+)
Ren
GND
GND
Figure 26: Enable input drive circuit example with isolation.
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