The L4981B from STMicroelectronics is a continuous mode average current Power Factor Correction (PFC) controller integrated circuit, specifically designed to bring power factor correction to a variety of applications. This device is part of STMicroelectronics' extensive power management portfolio and is ideal for systems that require compliance with the international regulations on power factor in AC-DC converters.

Key Features

• Highly Efficient Operation: The L4981B is capable of operating over a wide range of input voltages, maintaining high efficiency and a low total harmonic distortion (THD), which is crucial for energy-saving applications.
• Flexible Design: It supports a wide range of output power, making it suitable for a variety of applications, from low to high power requirements. Designers can adjust the operating frequency from 20kHz to 200kHz, allowing for flexibility in component selection and optimization of the power supply design.
• Improved Power Factor: By controlling the phase and the magnitude of the input current, it ensures that the power factor approaches unity, which is a requirement for many electronic products to minimize reactive power on the AC mains.
• Protection Features: The L4981B includes numerous protection features such as overvoltage, undervoltage lockout, and soft-start to prevent abrupt changes in power supply during start-up, enhancing the longevity and reliability of the application.

Applications

The versatility of the L4981B makes it suitable for a wide range of applications, including:

• High-efficiency AC-DC power converters
• Power supplies for Desktops, Servers, and TVs
• Industrial power systems
• Power adapters for notebooks and printers

In summary, the L4981B PFC controller is a robust and reliable solution for designers looking to improve power efficiency and meet regulatory standards for power factor correction. Its flexibility and comprehensive protection features make it an excellent choice for a wide array of power supply applications.