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LS2803R5S データシート(PDF) 2 Page - International Rectifier |
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LS2803R5S データシート(HTML) 2 Page - International Rectifier |
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2 / 16 page  2 www.irf.com LS-SERIES 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. Circuit Description An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD- 461C on the input power leads. 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). 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. 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. 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). The output voltage of all models can be adjusted using a single external resistor. Design Methodology |
同様の部品番号 - LS2803R5S |
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同様の説明 - LS2803R5S |
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