01/12/07

www.irf.com

1

HYBRID-HIGH RELIABILITY

DC/DC CONVERTER

ATO28XXT SERIES

Description

16V to 40VDC Input Range (28VDC Nominal)

5V, ±12V or 5V, ±15V Outputs Available

Indefinite Short Circuit and Overload Protection

15W Output Power

Fast Loop Response for Superior Transient

Characteristics

Operating Temperature Range from -55°C to

+125°C Available

Popular Industry Standard Pin-out

Resistance Seam Welded Case for Superior

Long Term Hermeticity

Efficiencies up to 81%

Shutdown from External Signal

200,000 Hour MTBF at 85°C

Standard Microcircuit Drawings Available

Features

ATO

28V Input, Triple Output

Three standard temperature grades are offered. Refer

to Part Numbering section. They are provided in a

standard plug-in package for PC mounting or in a

flanged package for more severe environments.

Manufactured in a facility fully 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 accommodated. Extensive computer simulation

using complex modeling enables modest design

modifications to be accommodated. Contact IR Santa

Clara with specific requirements.

The ATO28XXT Series of DC/DC converters feature

high power density and an extended temperature range

for use in military and industrial applications. Designed

to the nominal input requirements of MIL-STD-704D,

these devices have nominal 28VDC inputs with +5V

and

±12V or +5V and ±15V triple outputs to satisfy a

wide range of requirements. The circuit design

incorporates a pulse width modulated push-pull

topology operating in the feed-forward mode at a

nominal switching frequency of 250KHz. Input to output

isolation is achieved through the use of transformers in

the forward and feedback circuits.

The advanced feedback design provides fast loop

response for superior line and load transient characteristics

and offers greater reliability and radiation tolerance

than devices incorporating optical feedback circuits.

PD - 94582A