LT1249
Power Factor Controller U FEATURES
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■ DESCRIPTIO The 8-pin LT ®1249 provides active power factor correction for universal offline power systems with very few
external parts. By using fixed high frequency PWM current
averaging without the need for slope compensation, the
LT1249 achieves far lower line current distortion, with a
smaller magnetic element than systems that use either peak
current detection or zero current switching approach, in
both continuous and discontinuous modes of operation. Standard 8-Pin Packages
High Power Factor Over Wide Load Range
with Line Current Averaging
International Operation Without Switches
Instantaneous Overvoltage Protection
Minimal Line Current Dead Zone
Typical 250µA Start-Up Supply Current
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