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HMA423R409T Arkusz danych(PDF) 2 Page - International Rectifier

Numer części HMA423R409T
Szczegółowy opis  HIGH RELIABILITY DC-DC CONVERTER
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Producent  IRF [International Rectifier]
Strona internetowa  http://www.irf.com
Logo IRF - International Rectifier

HMA423R409T Arkusz danych(HTML) 2 Page - International Rectifier

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HMA423R409T/ES
The HMA Series converter utilizes a single-ended
forward topology with resonant reset. The nominal
switching frequency is 650KHz. Electrical isolation
and tight output regulation are achieved through the
use of a magnetically coupled feedback. Voltage
feed-forward with duty factor limiting provides high
line rejection and protection against output over
voltage in the event of an internal control loop failure.
This mechanism limits the maximum output voltage
to approximately 20% over the nominal regardless
of the line voltage.
Circuit Description
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD-
461C on the input power leads. A single-stage output
filter reduces the typical output ripple to less than
100mV peak-to-peak on the main output. Output
current is limited under any load fault condition to
approximately 130% of rated. An overload condition
causes the converter output to behave like a constant
current source with the output voltage dropping
below nominal. The converter will resume normal
operation when the load current is reduced below
the current limit point. This protects the converter
from both overload and short circuit conditions. The
current limit point exhibits a slightly negative
temperature coefficient to reduce the possibility of
thermal runaway. The current limit trip point is set
approximately 130% above the nominal maximum
to allow for short duration 60 watt peak output power.
An external inhibit port is provided to control converter
operation. The converter’s operation is inhibited
when this pin is pulled low. It is designed to be
driven by an open collecter logic device. The pin
may be left open for normal operation and has a
nominal open circuit voltage of 10.5V with respect to
the input return (pin 2).


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