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參數(shù)資料
| 型號： | M3G500512T |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉換器 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 63K |
| 代理商： | M3G500512T |
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G-SERIES
The G-Series converters utilize a single-ended for-
ward 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 volt-
age 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.
Circuit Description
Output current is limited under any load fault condi-
tion to approximately 125% of rated. An overload
condition causes the converter output to behave like
a constant current source with the output voltage drop-
ping below nominal. The converter will resume nor-
mal operation when the load current is reduced be-
low the current limit point. This protects the converter
from both overload and short circuit conditions. The
current limit point exhibits a slightly negative tem-
perature coefficient to reduce the possibility of ther-
mal runaway.
An under-voltage lockout circuit prohibits the con-
verter 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 approxi-
mately 34.5 volts and will shut down when the input
voltage drops below 35.5 volts. The one volt of hys-
teresis reduces the possibility of line noise interfer-
ing with the converter’s start-up and shut down.
An external inhibit port is provided to control con-
verter 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 con-
verter 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.
Design Methodology
The G-Series was developed using a proven con-
servative design methodology that includes select-
ing radiation tolerant and established reliability com-
ponents and fully derating to the requirements of
MIL-STD-975 and MIL-STD-1547. Careful sizing of
decoupling capacitors and current limiting resis-
tors 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 Ra-
diation Susceptibility (TREE ), Worst Case, Stress,
Thermal, Failure Modes and Effects (FMEA) and Re-
liability (MTBF).
Synchronization input and output allow multiple
converters to operate at a common switching fre-
quency. 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.
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.
The main ( +5 volt ) output is regulated by the control
loop and typically exhibits better than 1% regula-
tion. The auxiliary ( ±12 volt or ±15 volt ) outputs are
maintained through tight coupling in the power trans-
former and main output filter inductor and typically
exhibit better than 5% regulation. The main output
and auxiliary outputs are isolated from each other.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M3G500512T/EM | 制造商:International Rectifier 功能描述:RAD HARD DC/DC CONVERTER, ENGINEERING MODELS - Bulk |
| M3G500512T/P | 制造商:International Rectifier 功能描述:RAD HARD DC/DC CONVERTER, PROTOTYPE MODELS - Bulk |
| M3G500515T | 制造商:International Rectifier 功能描述:RAD HARD DC/DC CONVERTER, CLASS K - Bulk |
| M3G500515T/EM | 制造商:International Rectifier 功能描述:RAD HARD DC/DC CONVERTER, ENGINEERING MODELS - Bulk |
| M3G500515T/P | 制造商:International Rectifier 功能描述:RAD HARD DC/DC CONVERTER, PROTOTYPE MODELS - Bulk |
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