ATS Datasheet, PDF (2/10 Pages) International Rectifier – HIGH RELIABILITY DC/DC CONVERTER

ATS-SERIES
Circuit Description
The ATS Series converters utilize a single-ended
forward topology with resonant reset. The nominal
switching frequency is 500KHz. 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.
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
50mV peak-to-peak. Output current is limited under
any load fault condition to approximately 125% 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.
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 collector 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). The output voltage of all
models can be adjusted using a single external
resistor.
2
www.irf.com