AHE2800S Series
Hybrid - High Reliability
DC/DC Converters
DESCRIPTION
FEATURES
The AHE2800S 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-704 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 push-pull topology operating
in the feed-forward mode at a nominal switching
frequency of 250 KHz. Input to output isolation is
achieved through the use of transformers in the
forward and feedback circuits.
■ 17-40VDC input range
(28VDC nominal)
■ 5V, 12V and 15V outputs available
■ Indefinite short circuit and overload
protection
■ 17W/in3 power density
■ 15 and 20 watts output power models
■ Fast loop response for superior transient character-
istics
■ Operating temperature range from
-55°C to + 125°C available
The advanced feedback design provides fast loop
response for superior line and load transient charac-
teristics and offers greater reliability and radiation
tolerance than devices incorporating optical feed-
back circuits.
■ Popular industry standard pin-out
■ Resistance seam welded case for superior long
term hermeticity
■ Efficiencies up to 84%
■ Shutdown from external signal
■ Military screening
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 environments.
■ 325,000 hour MTBF at 85°C (AUC)
These converters are manufactured in a facility
fully qualified to MIL-PRF-38534. All processes used
to manufacture these converters have been
qualified to enable Lambda Advanced Analog to
deliver compliant devices. Two screening grades are
available to satisfy a wide range of requirements.
The CH grade converters are fully compliant to
MIL-PRF-38534 class H. The HB grade converters
are processed to full class H screening but do not
have class H element evaluation as required by
MIL-PRF-38534. Both grades are fully tested and
operate over the full military temperature range
without derating of output power. Variations in
electrical, mechanical and screening can be
accommodated. Extensive computer simulation
using complex modeling enables rapid design
modification to be provided. Contact Lambda
Advanced Analog with specific requirements.