Description
The highly integrated FAN6921ML combines a Power Factor Correction (PFC) controller and a QuasiResonant PWM controller. Integration provides cost effect design and allows for fewer external components. For PFC, FAN6921ML 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, FAN6921ML can reduce input current distortion at zero-crossing duration to
improve THD performance.

FEATUREs
ƒ Integrated PFC and Flyback Controller
ƒ Critical Mode PFC Controller
ƒ Zero-Current Detection for PFC Stage
ƒ Quasi-Resonant Operation for PWM Stage
ƒ Internal Minimum toff 8µs for QR PWM Stage
ƒ Internal 10ms Soft-Start for PWM
ƒ Brownout Protection
ƒ H/L Line Over-Power Compensation (OPC)
ƒ Latched Protection (FB Pin)
− Over-Power/ Overload Protection
− Short-Circuit Protection
− Open-Loop Protection
ƒ Externally Latch Triggering (RT Pin)
ƒ Adjustable Over-Temperature Latched (RT Pin)
ƒ VDD Pin & Output Voltage OVP (Latched)
ƒ Internal Temperature Shutdown (140°C)

APPLICATIONs
ƒ AC/DC NB Adapters
ƒ Open-Frame SMPS
ƒ Battery Charger