PD - 94549
ATR28XXS SERIES
28V Input, Single Output
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
Description
The ATR28XXS Series of DC/DC converters feature
high power density and an extended temperature range
for use in military and industrial applications. Designed
to MIL-STD-704D input requirements, these devices
have nominal 28VDC inputs with 5V, 12V and 15V single
outputs to satisfy a wide range of requirements. The
circuit design incorporates a pulse width modulated
single forward topology operating in the feed-forward
mode at a nominal switching frequency of 550KHz.
Input to output isolation is achieved through the use of
transformers in the forward and feedback circuits.
ATR
Features
n 16 to 40 VDC Input Range (28 VDC Nominal)
5V, 12V and 15V Outputs Available
n
n Indefinite Short Circuit and Overload
Protection
n Up to 35 W/in3 Power Density
n 30 Watt Output Power Models
n Fast Loop Response for Superior Transient
Characteristics
The advanced feedback design provides fast loop re-
sponse for superior line and load transient character-
istics and offers greater reliability and radiation toler-
ance than devices incorporating optical feedback cir-
cuits.
n Operating Temperature Range from -55°C to
+125°C
Three standard temperature grades are offered with
screening options. Refer to Part Number section. These
devices can be provided in a standard plug-in pack-
age for PC mounting or in a flanged package for more
severe environments.
n Popular Industry Standard Pin-Out
n Resistance Seam Welded Case for Superior
Long Term Hermeticity
n Ceramic Feed-thru Pins
n External Synchronization
n Efficiencies up to 84%
These converters are manufactured in a facility certi-
fied to MIL-PRF-38534. All processes used to manu-
facture these converters have been qualified to enable
Advanced Analog to deliver compliant devices.
n Shutdown from External Signal
n Military Screening
Four screening grades are available to satisfy a wide
range of requirements. The CH grade converters are
fully compliant to MIL-PRF-38534 for class H. The HB
grade converters are processed to full class H screen-
ing but do not have class H element evaluation as re-
quired by MIL-PRF-38534. Both grades are fully tested
to confirm operation over the full military temperature
range without derating of output power. The ES version
is a full temperature device without the full class H or
element evaluation. The non-suffix device is a low cost
limited temperature range option. Variations in
electrical, mechanical and screening can be ac-
commodated.
Extensive computer simulation using complex
modeling enables rapid design modification to
be provided. Contact Advanced Analog with spe-
cific requirements.
www.irf.com
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10/15/02