The FAN6862WTY is a highly integrated Quasi-Resonant (QR) flyback controller from Fairchild Semiconductor/ON Semiconductor designed for high-performance, offline power supplies. This controller incorporates advanced features to achieve high efficiency, low standby power consumption, and robust protection for various power adapter applications.

Applications:

• AC-DC Power Adapters for Laptops
• AC-DC Power Adapters for Mobile Devices
• Standby Power Supplies
• Auxiliary Power Supplies

Features:

• Quasi-Resonant (QR) Operation: Minimizes switching losses and EMI noise by turning on the MOSFET at the valley of the drain-source voltage.
• Valley Switching: Further reduces switching losses and improves efficiency.
• Low Startup Current: Reduces power consumption during startup, improving overall efficiency.
• Linearly Decreasing Frequency (LDF): Improves light-load efficiency and reduces audible noise.
• Frequency Hopping: Reduces EMI noise by spreading the switching frequency over a wider range.
• Cycle-by-Cycle Current Limiting: Protects the MOSFET from overcurrent conditions.
• Over-Voltage Protection (OVP): Prevents the output voltage from exceeding a safe limit.
• Overload Protection (OLP): Protects the power supply from overload conditions.
• Short-Circuit Protection (SCP): Protects the power supply from short-circuit conditions.
• Under-Voltage Lockout (UVLO): Prevents the MOSFET from operating at low voltages, preventing damage.

Benefits:

• High Efficiency: QR operation, valley switching, and LDF contribute to high efficiency across a wide load range.
• Low Standby Power Consumption: Optimized for low standby power requirements, meeting energy efficiency standards.
• Reduced EMI Noise: QR operation and frequency hopping reduce EMI noise, simplifying system design.
• Robust Protection: Comprehensive protection features ensure reliable operation and prevent damage to the power supply.
• Simplified Design: Integration of multiple functions simplifies the design process and reduces component count.

Additional Details:

The FAN6862WTY is typically used in conjunction with a MOSFET and a transformer to create a complete flyback power supply. The controller regulates the output voltage by adjusting the switching frequency and duty cycle of the MOSFET.

Key Specifications:

• Operating Frequency: Up to 100 kHz
• Startup Current: Low startup current

The FAN6862WTY provides a high-performance and cost-effective solution for designing efficient and reliable flyback power supplies.