KA3524 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – SMPS Controller

KA3524
SMPS Controller
www.fairchildsemi.com
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 volt-
age doublers, as well as other power control applications.
This device includes a 5V voltage regulator capable of sup-
plying up to 50mA to external circuit , a control ampli-
fier, 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 regu-
lator output transistor and each output switch are internally
current limiting and, to limit junction temperature, aninter-
nal thermal shutdown circuit is employed.
16-DIP
1
Internal Block Diagram
©2000 Fairchild Semiconductor International
Rev. 5.0