The FAN6961SYB is a highly integrated critical-conduction mode (CRM) power factor correction (PFC) controller from Fairchild/ON Semiconductor. It's designed to improve the power factor and reduce total harmonic distortion (THD) in AC-DC power supplies.

Applications:

• LED Lighting Power Supplies: Used in LED drivers to improve power factor and meet energy efficiency standards.
• LCD TV Power Supplies: Provides PFC in power supplies for LCD televisions and monitors.
• Desktop PC Power Supplies: Enhances the power factor of desktop computer power supplies.
• Adapter Power Supplies: Employed in AC adapters for laptops and other electronic devices to meet energy efficiency requirements.

Features:

• Critical Conduction Mode (CRM) Operation: Reduces switching losses and improves efficiency.
• Integrated Error Amplifier: Simplifies the design and reduces the number of external components.
• Cycle-by-Cycle Current Limiting: Protects the power supply from overcurrent conditions.
• Over-Voltage Protection (OVP): Prevents the output voltage from exceeding a safe level.
• Open-Loop Protection (OLP): Protects the power supply in case of an open-loop condition.

Benefits:

• Improved Power Factor: Reduces the amount of reactive power drawn from the AC line, improving energy efficiency.
• Reduced Total Harmonic Distortion (THD): Minimizes the distortion of the AC line current, complying with regulatory standards.
• Enhanced Efficiency: CRM operation minimizes switching losses, increasing the overall efficiency of the power supply.
• Robust Protection Features: OVP, OLP, and cycle-by-cycle current limiting protect the power supply from various fault conditions.

Additional Details:

The FAN6961SYB operates with a wide input voltage range and is available in a compact surface-mount package. It is designed to meet stringent energy efficiency standards, such as Energy Star and European Union directives. For precise details on switching frequency, protection thresholds, and operating conditions, consult the device datasheet.