features
  internal avalanche-rugged sensefet
  precision fixed operating frequency (67khz)
  burst-mode operation
  internal start-up circuit
  pulse-by-pulse current limiting
  over-voltage protection (ovp)
  overload protection (olp)
  internal thermal shutdown function (tsd)
  auto-restart mode
  under-voltage lockout (uvlo) with hysteresis
  built-in soft start
  secondary-side regulation
applications
  charger & adapter for mobile phone, pda, mp3
  auxiliary power for white goods, pc, c-tv, monitor
related application notes
  an-4137 design guidelines for off-line flyback
converters using fps™
  an-4141 troubleshooting and design tips for
fairchild power switch (fps™) flyback applications
  an-4147 design guidelines for rcd snubber of
flyback
  an-4134 design guidelines for off-line forward
converters using fps™
  an-4138 design considerations for battery charger
using green mode fairchild power switch (fps™)
description
the fsq100 consists of an integrated pulse width
modulator (pwm) and sensefet, specifically designed
for high-performance, off-line, switch-mode power
supplies (smps) with minimal external components.
this device is an integrated high-voltage power
switching regulator that combines a vdmos sensefet
with a voltage mode pwm control block. the integrated
pwm controller features include a fixed oscillator,
under-voltage lockout (uvlo) protection, leading
edge blanking (leb), an optimized gate turn-on/turn-off
driver, thermal shutdown (tsd) protection, and
temperature-compensated precision-current sources for
loop compensation and fault protection circuitry.
when compared to a discrete mosfet and controller or
rcc solution, the fsq100 device reduces total
component count and design size and weight, while
increasing efficiency, productivity, and system reliability.
this device provides a basic platform well suited for
cost-effective flyback converters.
ordering information
fpstm is a trademark of fairchild semiconductor corporation.