08/06/07

www.irf.com

1

HYBRID-HIGH RELIABILITY

DC/DC CONVERTER

ATR28XXT SERIES

Description

n 30W Output Power

n Flexible Output Loading

n -55°C to +125°C Operation

n Pin Compatible with ATO

n 0.410” Maximum Height

n 16V to 40VDC Input Range

n 500V Input to Output Isolation

n High Audio Rejection

n MIL-STD-704 Compatible

n Load Fault Protection - Short Circuit and

Overload

n TTL level Compatible Synchronization

n Standard Microcircuit Drawings Available

Features

ATR

28V Input, Triple Output

The ATR28XXT Series of DC/DC converters provide

30W of output power over the full military temperature

range with no derating. These devices are pin

compatible with the ATO series converters but offer

twice the maximum output power in a lower profile

package. A custom CMOS ASIC pulse width modulator

operating at a nominal switching frequency of 550KHz

combined with a unique magnetic feedback reduces

circuit complexity for enhanced reliability. These

converters provide 500V input to output isolation and

operate in highly efficient single forward mode.

The advanced feedback design and high operating

frequency provide an extremely wide bandwidth control

loop with high gain and phase margin. This results in

fast dynamic line and load response as well as superior

audio rejection. The control loop is compensated to

provide optimum performance over the full military

temperature range and over the 16V to 40V input voltage

range.

These converters are protected against both continuous

output short circuits and output overload. Either load

fault condition will result in operating in a low power

dissipation foldback mode. The converters will shut

down for approximately 15ms, then attempt to restart.

This cycle will continue indefinitely unless the load fault

is corrected. Recovery to normal operation is automatic

upon removal of the load fault.

Manufactured in a facility full qualified to MIL-PRF-38534,

these converters are fabricated utilizing DSCC qualified

processes. For available screening options, refer to

device screening table in the data sheet. Variations in

electrical, mechanical and screening can be limited

accomodated. Contact IR Santa Clara with specific

requirements.

PD-94551D