• Integrated 200V MOSFET
• Primary side CV/CC control eliminates the opto-coupler
• Valley turn-on of the primary MOSFET to achieve low switching losses
• Low start up current: 15μA typical
• Maximum switching frequency limitation 120kHz
• Compact package: SO8

SY22851 is a PWM controller with several features to enhance performance of Flyback converters. It integrates a 200V MOSFET to decrease physical volume. Both current and voltage regulation are achieved by primary side control technology for low cost application. To achieve higher efficiency and better EMI performance, SY22851 drives Flyback converters in the Quasi-Resonant mode.