SY22655ABC - Single Stage Flyback and PFC Controller with CV Control


  • Primary Side CV Control Eliminates the Opto-coupler
  • Valley Turn-on of the Primary MOSFET to Achieve Low Switching Loss
  • Internal High Current MOSFET Driver: 0.1A Sourcing and 0.5A Sinking
  • Power Factor >0.90 with Single-stage Conversion
  • Maximum Switching Frequency Limitation 100 kHz
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-6

Typical Application


SY22655 is a single stage Flyback and PFC controller targeting at Constant Voltage (CV) applications. Primary side control is applied to reduce the feedback circuit cost. It drives the Flyback converter in the Quasi-Resonant mode for high efficiency and achieves high power factor by constant on time control scheme. Adaptive PWM/PFM control is adopted for highest average efficiency.


  • AC/DC Adapters
  • BatteryChargers
  • LED Lighting