SY22652AFAC - Single Stage Flyback and PFC Controller with Primary Side Control for LED Lighting and Multiple Dimming Mode Options


  • 5%~100% Dimming Range
  • CV Mode for Bias Supply at <2.5% Dimming Signal
  • Primary Side Control Eliminates the Opto-coupler
  • Valley Turn-on of the Primary MOSFET to Achieve Low Switching Losses
  • 300mV Primary Current Sense Voltage Leads to a Lower Sense Resistance thus a Lower Conduction Loss
  • Internal high Current MOSFET Driver: 0.20A  Sourcing and 0.65A Sinking
  • Low Start up Current: 34μA Typical
  • Reliable Short LED and Open LED Protection
  • RoHS Compliant and Halogen Free
  • Compact Package: SO8

Typical Application


The SY22652A is a single stage Flyback and PFC controller targeting at LED Dimming applications, which can achieve up to 5% dimming level and high precision for full loading range. It is a primary side controller without applying any secondary feedback circuit for low cost, and drives the converter in the quasi-resonant mode to achieve high efficiency. It keeps the converter in constant on time operation to achieve high power factor.

SY22652A has CV mode for fast startup, especially in deep dimming. CV function is also can be used as the power supply of low energy MCU.


  • LED Lighting