SY22781AAAC - Single Stage Boost PFC LED Driver Dimmable, High PF and Low BOM Cost


  • Compatible with Leading Edge/Trailing Edge Dimmer
  • High PF without Any Dimmer
  • 350V MOSFET Integrated
  • Quasi-Resonant Operation
  • Reliable Open LED Protection
  • Thermal Fold Back
  • Low BOM Cost
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-5

Typical Application


SY22781A is a single-stage Boost PFC driver for LED lighting applications. Good compatibility is achieved with Leading/Trailing edge dimmer and high PF is achieved without any dimmer.

SY22781A drives the converter in Quasi-Resonant mode to achieve high efficiency. Reliable Open LED protections are integrated.

SY22781A integrates high voltage power FET inside to save driver space further.

SY22781A is available in SOT23-5 package.


  • LED Lighting
  • Leading Edge Dimming
  • Trailing Edge Dimming