KA3524

www.fairchildsemi.com KA3524 SMPS Controller Features Complete PWM power control circuit Operation beyond 100KHz 2% frequency stability with temperature Total quiescent current less than 10mA Single ended or push-pull outputs Current limit amplifier provides external component protection On-chip protection against excessive junction temperature and output current 5V, 50mA linear regulator output available to user Description The KA3524 regulating pulse width modulator contains all of the control circuit necessary to implement switching regulators of either polarity, transformer coupled DC to DC converters, transformerless polarity converters and voltage doublers, as well as other power control applications. This device includes a 5V voltage regulator capable of supplying up to 50mA to external circuit , a control amplifier, an oscillator, a pulse width modulator, a phase splitting flip-flop, dual alternating output switch transistors, and current limiting and shut-down circuit. Both the regulator output transistor and each output switch are internally current limiting and, to limit junction temperature, aninternal thermal shutdown circuit is employed. 16-DIP 1 Internal Block Diagram Rev. 5.0 ©2000 Fairchild Semiconductor International KA3524 Absolute Maximum Ratings Parameter Supply Voltage Reference Output Current Output Current (Each Output) Oscillator Charging Current (pin 6 or 7) Lead Temperature (Soldering, 10 sec) Power Dissipation (TA = 25°C) O...