M3GB-SERIES 28V Input, Single/Dual Output HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
2020-04-26
M3GB-Series is part of the International Rectifier HiRel
family of products. The M3GB-Series of DC-DC converters
are second generation design of the legacy M3G-Series
product family but with enhanced overall performance.
M3GB-Series is form, fit and functional equivalent to the
first generation M3G-Series. It is designed to be backward
compatible to the M3G-Series with the addition of an
output voltage adjustment pin for the single output models.
Much the same as the original M3G-Series, these
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 feedback and an internal
EMI filter that utilizes multilayer ceramic capacitors that are
subjected to extensive lot screening for optimum 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" x 2" x
0.475" package constructed of an Aluminum/SiliconCarbide (Al/SiC) base and an Alloy 48 ring frame and they
weigh less than 100 grams. The package utilizes rugged
ceramic feed-through copper core pins and is sealed using
parallel seam welding.
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.
Non-flight versions of the M3GB-Series converters are
available for system development purposes. Variations in
electrical specifications and screening to meet custom
requirements can be accommodated.
The M3BG-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.
An internal EMI filter allows the converter to meet the
conducted emissions requirements of MIL-STD-461C on
the input power leads. A two-stage output filter reduces
the typical output ripple to less than 20mV peak-to-peak.
Output current 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.
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 below 15.3 volts. The
1.2V 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 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.
Remote sense is provided on the single output models to
compensate for voltage drops in the interconnects
between the converter and the load. The output voltage
of dual output models can be adjusted by a single
external resistor.
family of products. The M3GB-Series of DC-DC converters
are second generation design of the legacy M3G-Series
product family but with enhanced overall performance.
M3GB-Series is form, fit and functional equivalent to the
first generation M3G-Series. It is designed to be backward
compatible to the M3G-Series with the addition of an
output voltage adjustment pin for the single output models.
Much the same as the original M3G-Series, these
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 feedback and an internal
EMI filter that utilizes multilayer ceramic capacitors that are
subjected to extensive lot screening for optimum 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" x 2" x
0.475" package constructed of an Aluminum/SiliconCarbide (Al/SiC) base and an Alloy 48 ring frame and they
weigh less than 100 grams. The package utilizes rugged
ceramic feed-through copper core pins and is sealed using
parallel seam welding.
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.
Non-flight versions of the M3GB-Series converters are
available for system development purposes. Variations in
electrical specifications and screening to meet custom
requirements can be accommodated.
The M3BG-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.
An internal EMI filter allows the converter to meet the
conducted emissions requirements of MIL-STD-461C on
the input power leads. A two-stage output filter reduces
the typical output ripple to less than 20mV peak-to-peak.
Output current 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.
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 below 15.3 volts. The
1.2V 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 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.
Remote sense is provided on the single output models to
compensate for voltage drops in the interconnects
between the converter and the load. The output voltage
of dual output models can be adjusted by a single
external resistor.
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