SY22679BABC - Single Stage Flyback And PFC Controller With Primary Side Control For LED Lighting


  • Primary Side Control Eliminates the Opto-coupler.
  • Valley Turn-on of the Primary MOSFET to Achieve Low Switching Loss
  • Power Factor >0.90 with Single-stage Conversion
  • Reliable Short LED and Open LED Protection
  • Quick Start up <500ms
  • Low Start up Current:15µA Typical
  • RoHS Compliant and Halogen Free
  • Package: SOT23-6

Typical Application


The SY22679B is a single stage Flyback and PFC controller targeting at LED lighting applications. It is a primary side controller without applying any secondary feedback circuit for low cost, and drives the Flyback converter in the quasi-resonant mode to achieve higher efficiency. It keeps the Flyback converter in constant on time operation to achieve high power factor. It adopts special design to achieve quick start up and reliable protection for safety requirement.


  • LED Lighting