The FAN6921MR is a highly integrated power factor correction (PFC) and quasi-resonant (QR) flyback controller. It is designed for offline power supplies requiring high efficiency, low standby power, and robust protection features. This controller integrates several functions to minimize external components and reduce overall system cost.

Applications

• AC-DC Power Supplies
• Adapters
• Chargers
• LED Lighting Power Supplies
• Auxiliary Power Supplies

Features

• Integrated PFC and QR Flyback Controller
• Low Startup Current
• Quasi-Resonant Operation for High Efficiency
• Frequency Foldback for Improved Light-Load Efficiency
• Cycle-by-Cycle Current Limiting
• Over-Voltage Protection (OVP)
• Over-Temperature Protection (OTP)
• Under-Voltage Lockout (UVLO)
• Open-Loop Protection

Benefits

• High Efficiency: The quasi-resonant operation and frequency foldback features enable high efficiency across a wide load range.
• Low Standby Power: The low startup current and optimized control scheme minimize standby power consumption.
• Reduced Component Count: The integrated PFC and QR flyback controller reduces the number of external components required, simplifying design and lowering cost.
• Robust Protection: The comprehensive protection features ensure reliable operation and prevent damage to the power supply.
• Simplified Design: The highly integrated design simplifies the design process and reduces development time.

Additional Details

The FAN6921MR operates in quasi-resonant mode to minimize switching losses and improve efficiency. It also features frequency foldback, which reduces the switching frequency at light loads to further improve efficiency. The controller includes a variety of protection features, such as cycle-by-cycle current limiting, over-voltage protection, over-temperature protection, and under-voltage lockout. These features ensure reliable operation and prevent damage to the power supply. The FAN6921MR is available in a small SOIC-16 package.