FSQ500L

FAIRCHILD SEMICONDUCTOR  FSQ500L  芯片, 配电开关, PWM, FET, 3W, 4SOT223

The is an Integrated Power Switch Pulse Width Modulator with 130kHz frequency and no bias winding for 2.5W offline fly-back converters. It is specially designed for a replacement of linear power supplies. This device combines current-mode Pulse Width Modulator PWM with a sense-FET. The integrated PWM controller features a fixed oscillator, under voltage lockout UVLO protection, overload protection OLP, leading-edge blanking LEB, an optimized gate turn-ON/OFF driver, thermal shutdown TSD protection with hysteresis and temperature-compensated precision-current sources for loop compensation. When compared to a linear power supply, the FSQ500L device reduces total size and weight, while increasing efficiency, productivity and system reliability. This device provides a basic platform for fly-back converters.

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Internal start-up switch

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Soft-start time tuned by external capacitor

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Pulse-by-pulse current limit

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Auto-restart mode

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No need for auxiliary bias winding

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130kHz Precision fixed operating frequency