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International Rectifier Electronic Components Datasheet

M3G2803R305R4T Datasheet

HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

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PD-97795
HIGH RELIABILITY RADIATION
HARDENED DC-DC CONVERTER
M3G2803R305R4T
28V Input, Triple Output
Description
The M3G-Series of DC-DC converters are radiation
hardened, high reliability converters designed for
extended operation in hostile environments. Their small
size and low weight make them ideal for applications
such as geostationary earth orbit satellites and deep
space probes. They exhibit a high tolerance to total
ionizing dose, single event effects and environmental
stresses such as temperature extremes, mechanical
shock, and vibration.
The converters incorporate a fixed frequency single
ended forward topology with magnetic feed back and
an internal EMI filter that utilizes metallized film capacitors
instead of large multilayer ceramic capacitors for
improved reliability. These converters are capable of
meeting the conducted emissions and conducted
susceptibility requirements of MIL-STD-461C without
any additional components. External inhibit and
synchronization input and output allow these converters
to be easily incorporated into larger power systems.
They are enclosed in a hermetic 3.5" x 2.5" x 0.475"
package constructed of an Aluminum/Silicon-Carbide
(Al/SiC) base and an Alloy 48 ring frame and they weigh
less than 110 grams. The package utilizes rugged ceramic
feed-through copper core pins and is sealed using
parallel seam welding.
Full environmental screening includes temperature
cycling, constant acceleration, fine and gross leak,
particle impact noise detection (PIND), radiographic and
320 hours burn-in.
Non-flight versions of the M3G-Series converters are
available for system development purposes. Variations
in electrical specifications and screening to meet custom
requirements can be accommodated.
Features
n Total Dose > 200 Krad(Si),
typically usable to > 1 Mrad(Si)
n SEE 82 MeV.cm2/mg
n Internal EMI Filter, converter capable of
meeting MIL-STD-461C CE03
n Low Weight, < 110 grams
n Magnetically Coupled Feedback
n 18V to 50V DC Input Range
n Up to 35W Output Power
n Main Output Isolated from Dual Outputs
n High Efficiency - to 75%
n -55°C to +125°C Operating Temperature Range
n 100M@ 500VDC Isolation
n Under-Voltage Lockout
n Synchronization Input and Output
n Short Circuit and Overload Protection
n Output Over Voltage Limiter
n External Inhibit
n > 5,000,000 Hour MTBF
Applications
n Geostationary Earth Orbit Satellites (GEO)
n Deep Space Satellites / Probes
n Strategic Weapons and Communication
Systems
www.irf.com
1
08/24/12
http://www.Datasheet4U.com


International Rectifier Electronic Components Datasheet

M3G2803R305R4T Datasheet

HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

No Preview Available !

M3G2803R305R4T
Circuit Description
The M3G-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.
This mechanism limits the maximum output voltage
to approximately 20% over the nominal regardless of
the line voltage.
An internal EMI filter reduces the conducted
emissions to less than 5mA rms on the input power
leads. A two-stage output filter reduces the typical
output ripple to less than 20mV peak-to-peak.
The main output is regulated by the control loop and
typically exhibits better than 1% regulation. The
auxiliary outputs are maintained through tight
coupling in the power transformer and main output
filter inductor and typically exhibit better than 5%
regulation. The main output and auxiliary outputs
are isolated from each other.
Output power is limited under any load fault condition
to approximately 125% of rated. An overload
condition causes 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. The current limit point exhibits a slightly
negative temperature coefficient to reduce the
possibility of thermal runaway.
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
16.5 volts and will shut down when the input voltage
drops 15.5 volts. The one volt of hysteresis reduces
the possibility of line noise interfering with the
converter’s start-up and shut down.
An external inhibit port is provided to control converter
operation. The nominal threshold relative to the input
return (pin 2) is 1.4V. If 2.0 volts or greater are applied
to the Inhibit pin (pin 3) then the converter will
operate normally. A voltage of 0.8V or less will cause
the converter to shut-down. The pin may be left
open for normal operation and has a nominal open
circuit voltage of 4.0V.
Synchronization input and output allow multiple
converters to operate at a common switching
frequency. Converters can be synchronized to one
another or to an externally provided clock. This can
be used to eliminate beat frequency noise or to avoid
creating noise at certain frequencies for sensitive
systems.
Design Methodology
The M3G-Series was developed using a proven
conservative design methodology which includes
selecting radiation tolerant and established reliability
components and fully derating to the requirements
of MIL-STD-975 and MIL-STD-1547 except for the
CDR type ceramic capacitors, a capacitor with 50V
rating is used for in-circuit voltage stress of less than
10V. Careful sizing of decoupling capacitors and
current limiting resistors minimizes the possibility of
photo-current burn-out. Heavy derating 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 and RadSPICE were used
extensively to predict and optimize circuit
performance for both beginning and end-of-life.
Thorough design analyses include Radiation
Susceptibility (TREE ), Worst Case, Stress, Thermal,
Failure Modes and Effects (FMEA) and Reliability
(MTBF).
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Part Number M3G2803R305R4T
Description HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
Maker IRF
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