KA3524

www.fairchildsemi.com

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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

Internal Block Diagram

Rev. 5.0
2000 Fairchild Semiconductor International