FAN6920MR

FAN6920MR — Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller April 2011 FAN6920MR Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Controller Features               Integrated PFC and Flyback Controller Critical-Mode PFC Controller Zero-Current Detection for PFC Stage Quasi-Resonant Operation for PWM Stage Internal Minimum 5µs tOFF for QR PWM Stage Internal 5ms Soft-Start for PWM Brownout Protection High / Low Line Over-Power Compensation Auto-Recovery Over-Current Protection Auto-Recovery Open-Loop Protection Externally Auto-Recovery Triggering (RT Pin) Adjustable Over-Temperature Protection VDD Pin and Output Voltage OVP (Auto-Recovery) Internal Over-Temperature Shutdown (140°C) Description The highly integrated FAN6920MR combines Power Factor Correction (PFC) controller and quasi-resonant PWM controller. Integration provides cost-effective design and reduces external components. For PFC, FAN6920MR uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power-factor correction. With an innovative THD optimizer, FAN6920MR can reduce input current distortion at zero-crossing duration to improve THD performance. For PWM, FAN6920MR provides several functions to enhance the power system performance: valley detection, green-mode operation, and high / low line over-power compensation. Protection functions include secondary-side open-loop and over-current with autorecovery protec...