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Motore di ricerca datesheet componenti elettronici |
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HMA423R409T Scheda tecnica(PDF) 2 Page - International Rectifier |
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HMA423R409T Scheda tecnica(HTML) 2 Page - International Rectifier |
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2 / 8 page  2 www.irf.com HMA423R409T/ES The HMA Series converter utilizes a single-ended forward topology with resonant reset. The nominal switching frequency is 650KHz. 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. Circuit Description An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD- 461C on the input power leads. A single-stage output filter reduces the typical output ripple to less than 100mV peak-to-peak on the main output. Output current is limited under any load fault condition to approximately 130% 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. The current limit trip point is set approximately 130% above the nominal maximum to allow for short duration 60 watt peak output power. An external inhibit port is provided to control converter operation. The converter’s operation is inhibited when this pin is pulled low. It is designed to be driven by an open collecter logic device. The pin may be left open for normal operation and has a nominal open circuit voltage of 10.5V with respect to the input return (pin 2). |
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