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International Rectifier Electronic Components Datasheet

ARE2812S Datasheet

DC-DC CONVERTER

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HIGH RELIABILITY
RADIATION HARDENED
LOW POWER
DC-DC CONVERTER
PD-97837C
ARE SERIES
28V Input, Single Output
Description
The ARE Series of DC-DC converters are low power
radiation hardened, high reliability devices designed for
radiation environments such as those encountered by
geostationary earth orbit satellites, deep space probes
and communication systems. Features include small size,
high efficiency, low weight and a high tolerance to total
ionizing dose, single event effects and environmental
stresses such as temperature extremes, mechanical
shock, and vibration.
The ARE Series converters incorporate a fixed frequency
flyback topology with magnetic feedback. All models
include an external inhibit port. They are encased in a
hermetic 1.075" x 1.075" x 0.31” AlSi package and weigh
less than 15 grams. The package utilizes rugged ceramic
feed-through copper core pins and is hermetically sealed
using laser welding.
Environmental screening includes temperature cycling,
constant acceleration, fine and gross leak, and burn-in as
specified by MIL-PRF-38534 for class K hybrids.
Non-flight versions of the ARE Series converters are
available for system development purposes. Variations in
electrical specifications and screening to meet custom
requirements can be accommodated.
ARE
Features
Total Dose Guaranteed to 100 kRads(Si)
SEE with LET up to 64 MeV.cm2/mg
Low Weight < 15 grams
Magnetically Coupled Feedback
18V to 50V DC Input Range
Up to 5W Output Power
Single Output Models Include
3.3, 5, 12 and 15V
Low Quiescent Current
High Efficiency - to 80%
-55°C to +85°C Operating Temperature Range
100M@ 100V DC Isolation
Under-Voltage Lockout
Short Circuit and Overload Protection
External Inhibit
Output Adjustment / Remote Sense
Applications
Geostationary Earth Orbit Satellites (GEO)
Deep Space Satellites / Probes
Strategic Weapons and Communication System
1
International Rectifier HiRel Products, Inc.
2020-08-31


International Rectifier Electronic Components Datasheet

ARE2812S Datasheet

DC-DC CONVERTER

No Preview Available !

ARE SERIES
(28V Input, Single Output)
Circuit Description
The ARE Series converters utilize a flyback topology with
a nominal switching frequency of 400 kHz. Electrical
isolation and tight output regulation are achieved through
the use of a magnetically coupled feedback.
Output current is limited under any load fault condition to
approximately 165% of rated current. An overload
condition cause the converter output to behave like a
constant current source with the output voltage dropping
below nominal. The converter will resume normal
operation when the load current is reduced below the
current limit point. This protects the converter from both
overload and short circuit conditions. There are no
latching elements included in the load fault protection
circuits to eliminate the possibility of falsely triggering the
protection circuits during single event radiation exposure.
An under-voltage lockout circuit prohibits the converter
from operating when the line voltage is too low to maintain
the output voltage. The converter will not start until the
line voltage rises to approximately 17 volts and will shut
down when the input voltage drops below 16 volts. The
hysteresis reduces the possibility of line noise interfering
with the converters start-up and shut down circuitry.
An external inhibit port is provided to control converter
operation. The converters operation is inhibited when
this pin is pulled low. It is intended to be driven by an
open collector device. The pin may be left open for
normal operation and has a nominal open circuit voltage
of about 13V.
Design Methodology
The ARE Series was developed using a proven
conservative design methodology, which includes
selecting radiation tolerant, and established reliability
components and fully de-rating to the requirements of
MIL-STD-975, MIL-STD-1547, and NASA EE-INST-002.
Conservative de-rating of the radiation-hardened power
MOSFET virtually eliminates the possibility of SEGR and
SEB. A magnetic feedback circuit is utilized instead of
opto-couplers to minimize temperature, radiation and
aging sensitivity. PSPICE was used extensively to predict
and optimize circuit performance for both beginning and
end-of-life. Thorough design analyses include, Worst
Case, Stress, Thermal, Failure Modes and Effects
(FMEA) and Reliability (MTBF).
2
International Rectifier HiRel Products, Inc.
2020-08-31


Part Number ARE2812S
Description DC-DC CONVERTER
Maker International Rectifier
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ARE2812S Datasheet PDF






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