features
• precision fixed operating frequency (50khz)
• low start-up current(typ. 100ua)
• pulse by pulse current limiting
• over current protection
• over voltage protection (min. 25v)
• internal thermal shutdown function
• under voltage lockout
• internal high voltage sense fet
• auto-restart mode
applications
• smps for vcr, svr, stb, dvd & dvcd
• smps for printer, facsimile & scanner
• adaptor for camcorder
description
the fairchild power switch(fps) product family is specially
designed for an off-line smps with minimal external
components. the fairchild power switch(fps) consists of a
high voltage power sensefet and a current mode pwm ic.
included pwm controller integrates the fixed frequency
oscillator, the under voltage lock-out, the leading edge
blanking, the optimized gate turn-on/turn-off driver, the
thermal shutdown protection, the over voltage protection,
and the temperature compensated precision current sources
for the loop compensation and the fault protection circuitry.
compared to a discrete mosfet and a pwm controller or
an rccsolution, a fairchild power switch(fps) can reduce
the total component count, design size and weight and at the
same time increase efficiency, productivity, and system
reliability. it has a basic platform well suited for the cost
effective design in either a flyback converter or a forward
converter