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LAMBDA ADVANCED ANALOG INC.
AHE281XD Series
Dual Output, Hybrid - High Reliability
DC/DC Converter
DESCRIPTION
FEATURES
The AHE 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 ±12V and
±15V dual 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.
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17 To 40 Volt Input Range (28VDC Nominal)
± 12 and ± 15 Volt Outputs Available
Indefinite Short Circuit and Overload
Protection
12.9W/in3 Power Density
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15 Watts Output Power
Fast Loop Response For Superior Transient
Characteristics
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Operating Temperature Range From -55°C to
+125°C Available
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.
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Popular Industry Standard Pin-Out
Resistance Seam Welded Case For Superior
Long Term Hermeticity
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Efficiencies Up to 82%
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are available in four
screening grades to satisfy a wide range of
requirements. The CH grade is fully compliant to
the requirements of MIL-PRF-38534 for class H.
The HB grade is processed and screened to the
class H requirement, but may not necessarily meet
all of the other MIL-PRF-38534 requirements, e.g.,
element evaluation and Periodic Inspection (P.I.)
not required. Both grades are tested to meet the
complete group "A" test specification over the full
military temperature range without output power
deration. Two grades with more limited screening
are also available for use in less demanding
applications. Variations in electrical, mechanical
and screening can be accommodated. Contact
Lambda Advanced Analog for special requirements.
Shutdown From External Signal
Military Screening
314,000 Hour MTBF at 85°C, AUC