The FA7738N/P is a power factor correction (PFC) controller IC manufactured by Fuji Electric. This IC is designed to improve the power factor in AC-DC power supplies. By actively shaping the input current waveform to be in phase with the input voltage, it minimizes harmonic distortion and enhances energy efficiency.

Applications:

• Power supplies for LCD TVs
• Power supplies for LED lighting systems
• Power supplies for desktop PCs
• Power supplies for servers and workstations
• Industrial power supplies

Features:

• Critical Conduction Mode (CRM) operation
• Low startup current
• Overvoltage protection (OVP)
• Overcurrent protection (OCP)
• Open loop protection
• Undervoltage lockout (UVLO)
• Soft-start function

Benefits:

• Improved power factor: Corrects the power factor to near unity, leading to reduced energy waste and lower electricity bills.
• Reduced harmonic distortion: Minimizes the generation of harmonic currents, improving power quality and preventing interference with other electronic devices.
• Enhanced system reliability: Protection features safeguard the power supply from damage due to overvoltage, overcurrent, and other fault conditions.
• Simplified design: Integrates multiple functions into a single IC, reducing the number of external components required.
• Compliance with energy efficiency standards: Helps power supplies meet regulatory requirements for energy efficiency.

Additional Details:

The FA7738N/P operates in Critical Conduction Mode (CRM), also known as Transition Mode. CRM operation offers a good balance between efficiency and component size. It includes overvoltage protection (OVP), which prevents the output voltage from exceeding a safe level. Overcurrent protection (OCP) limits the output current to prevent damage from overload conditions. Undervoltage lockout (UVLO) ensures that the IC starts operating only when the input voltage is sufficient. The soft-start function minimizes inrush current during startup. The FA7738N is typically available in an 8-pin DIP package, while the FA7738P is available in an 8-pin SOP package.