PD - 94550
ATR28XXD SERIES
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
Description
The ATR28XXD 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 鹵12V and 鹵15V dual
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.
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.
Three standard temperature grades are offered with
screening options. Refer to Part Number section. They
can be provided in a standard plug-in package for PC
mounting or in a flanged package for more severe en-
vironments.
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.
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
and operate 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 ele-
ment evaluation. The non-suffix device is a low cost
28V Input, Dual Output
ATR
Features
n
16 to 40 VDC Input Range (28 VDC Nominal)
n
鹵
12V and
鹵
15V Outputs Available
n
Indefinite Short Circuit and Overload
Protection
3
n
35 W/in Power Density
n
30 Watt Output Power
n
Fast Loop Response for Superior Transient
Characteristics
n
Operating Temperature Range from -55擄C to
+125擄C
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
High Efficiency
n
Shutdown from External Signal
n
Military Screening
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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