KA3524 Datasheet | Fairchild Semiconductor

Features plete PWM power control circuit Operation beyond 100KHz 2% frequency stability with temperature Total quiescent current less than 10m A Single ended or push-pull outputs Current limit amplifier provides external ponent protection - On-chip protection against excessive junction temperature and output current - 5V, 50m A 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 50m A 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 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) Operating Temperature Storage Temperature Symbol VCC IREF IO ICHG(OSC) TLEAD PD TPOR TSTG Value 40 50 100 5 300 1000 0 ~ +70 -65 ~ + 150 Unit V m A m A m A °C m W °C °C Electrical Characteristics (VIN=20V, f=20KHz, TA = 0 to +70°C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Ripple Rejection Short-Circuit Output Current Temperature Stability Long Term Stability OSCILLATOR SECTION Maximum Frequency Initial Accuracy Frequency Change with Voltage Frequency Change with Temperature Clock...