The FAN7621 is a current mode PWM controller. It is designed for high-performance, cost-effective power supplies. The FAN7621 is manufactured by Fairchild/ON Semiconductor and categorized as END-OF-LIFE.

Applications

• Power supplies for adapters
• Power supplies for chargers
• Open-frame power supplies
• Auxiliary power supplies
• Standby power supplies

Features

• Current mode control
• Low start-up current
• Adjustable switching frequency
• Cycle-by-cycle current limiting
• Over-voltage protection (OVP)
• Under-voltage lockout (UVLO)
• Internal slope compensation
• Soft-start function

Benefits

• High efficiency in power supplies
• Low standby power consumption
• Improved system reliability with built-in protection features
• Simplified power supply design
• Reduced component count
• Stable and reliable operation

Additional Details

The FAN7621 uses a current-mode PWM control scheme. This provides good line regulation and load regulation. It is typically supplied in an 8-pin DIP or SOIC package. External components are required to complete the power supply circuit, including a power transformer, rectifier diodes, filter capacitors, and MOSFET. Proper heat sinking might be required for the MOSFET depending on the application and operating conditions. Refer to the Fairchild/ON Semiconductor datasheet for detailed electrical characteristics, application circuits, and design considerations. Given the end-of-life status, new designs should consider alternative components.