• Proprietary Operation Mode for Flyback ZVS
• Adaptive Gate Voltage Control
• DSEN Falling Slope Rate Detecting to Prevent SR False Trigger
• 130V DSEN Pin to Directly Sense DRAIN Voltage of SR MOS
• Power Saving Mode to Improve Light Load Efficiency
• Dual Power Supply Channel for 3.3V to 21V Output Systems
• Compact Package: CPC8 

The SY5239 is a Flyback SR controller compatible with QR mode converter to achieve ZVS operation. The primary side PWM converter must work in the quasi-resonant mode. The SY5239 adopts proprietary operation mode to achieve Flyback ZVS turn-on, which can greatly improve Flyback efficiency and power density. The SY5239 also adopts the adaptive gate voltage control for safe operation.

The SY5239 adopts DSEN voltage falling slope rate detecting technology to avoid SR MOSFET false turn on by parasitic ring in DCM or QR mode.

The SY5239 is available in a CPC8 package.