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International Rectifier Electronic Components Datasheet

LS2803R3S Datasheet

HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

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PD-96964E
HYBRID - HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
Description
The LS-Series of DC-DC converters are, high reliability
devices designed for hostile radiation hardened
environments. The LS-Series provide up to 30 watts
output power, small size, low weight, integrated EMI
filtering and a high tolerance to environmental stresses
such as radiation, temperature extremes, mechanical
shock, and vibration. Extensive documentation
including, thermal analysis, stress analysis and reliability
predictions are available.
The LS-Series of converters incorporate a fixed
frequency single forward topology with magnetic
feedback and an internal EMI filter. These converters
are capable of meeting the conducted emissions
requirements of MIL-STD-461C without any additional
components. All models include an external inhibit port
and have an adjustable output voltage. They are
enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package
and weigh less than 80 grams. The package utilizes
rugged ceramic feed-through copper core pins and is
sealed using parallel seam welding.
The LS-Series of DC-DC converters provide same
mechanical outline, power ratings, for backward pin
compatibility, to their lower radiation tolerant counterpart
M3L and Military series ATS DC-DC converters. The
common platform design allows for similarity between
military and space system architectures. For higher
output power applications the HM, M3H and M3G-Series
of DC-DC converters are recommended.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DLA
Land and Maritime qualified processes. For available
screening options, refer to device screening table in the
data sheet.
Variations in electrical specifications and screening to
meet custom requirements can be accommodated.
www.irf.com
LS-SERIES
28V Input, Single/Dual Output
LS
Features
n 18 to 40V DC Input Range
n Total Ionization Dose > 100K Rad(Si)
n SEE Hardened to LET (Heavy Ions) up to
82 MeVcm2/mg (SEU, SEL, SEGB, SEGR)
n Internal EMI filter; Converter Capable of
meeting MIL-STD-461C CE03
n Low Weight, < 80 grams
n Magnetically Coupled Feedback
n Up to 30W Output Power
n Single and Dual Output Models Include
1.5, 2.5, 3.3, 5, 12, 15, ±5, ±12 and ±15V
n High Efficiency - to 83%
n 100M@ 500VDC Isolation
n Under-Voltage Protection
n Short Circuit and Overload Protection
n Adjustable Output Voltage
n External Inhibit
n > 4,000,000 Hour MTBF (SF)
n Standard Microcircuit Drawings Available
Applications
n Geo Synchronous Satellite
n Low Earth Orbit
n Deep Space Probe
n Communication and Display Systems
n Payload and Experiment LVPS
1
10/12/12


International Rectifier Electronic Components Datasheet

LS2803R3S Datasheet

HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

No Preview Available !

LS-SERIES
(28V Input, Single/Dual Output)
Circuit Description
The LS-Series converters utilize a single-ended
forward topology with resonant reset. The nominal
switching frequency is 500kHz. Electrical isolation
and tight output regulation are achieved through the
use of a magnetically coupled feedback. Voltage
feed-forward with duty factor limiting provides high
line rejection and protection against output over
voltage in the event of an internal control loop failure.
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD-
461C on the input power leads.
Output current is limited under any load fault
condition to approximately 125% of rated. An
overload condition causes the converter output
voltage to drop 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. The current limit point exhibits a slightly
negative temperature coefficient to reduce the
possibility of thermal runaway.
An external inhibit port is provided to control
converter operation. The converter’s operation is
inhibited when this pin is pulled low. It is intended
to be driven by an open collector logic device. The
pin may be left open for normal operation and has a
nominal open circuit voltage of 11V with respect to
the input return (pin 2).
The output voltage of all models can be adjusted
using a single external resistor.
Design Methodology
The LS-Series was developed using a proven
conservative design methodology derived from other
space level designs that includes selection of
established reliability components and fully de-
rating to the requirements of MIL-STD-975 except
for the CDR type of capacitors, a capacitor with 50V
rating is used for in-circuit voltage stress of less
than10V. A magnetic feedback circuit is utilized
instead of opto -couplers to minimize temperature,
aging and radiation sensitivity. PSPICE was used
extensively to predict and optimize circuit
performance for both beginning and end-of-life.
Thorough design analyses include stress, thermal,
and reliability (MTBF).
2 www.irf.com


Part Number LS2803R3S
Description HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
Maker International Rectifier
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