• Multistage Dimming Mode
• CV Mode for Bias supply when ADIM<37mV
• 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: 0.2A  Sourcing and 0.6A Sinking
• Low Start up Current: 34μA Typical
• Reliable Short LED and Open LED Protection
• RoHS Compliant and Halogen Free
• Compact Package: SO8

The SY22658 is a single stage Flyback and PFC controller targeting at LED Dimming applications, which can achieve multistage dimming 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.

SY22658 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.