Introducing the L4981A Power Factor Corrector

The L4981A from STMicroelectronics is a versatile and high-performance Active Power Factor Corrector (PFC) designed to meet the rigorous demands of power supply design. This advanced integrated circuit is engineered to enhance power efficiency and reduce energy consumption, making it an ideal solution for a wide range of applications, including:

• Switch-mode power supplies (SMPS)
• Power adapters and chargers
• Lighting systems
• Consumer electronics

With its ability to operate over a wide input voltage range, the L4981A is suitable for universal AC input systems. It can be used in both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM), offering flexibility to meet different design requirements and optimize for efficiency or component size.

Features of the L4981A:

• Highly Efficient Power Conversion: The L4981A ensures excellent power factor values, close to unity, which leads to efficient use of energy and compliance with international power regulations.
• Versatile Operating Modes: Designers can select between CCM and DCM, allowing for a tailored approach to efficiency and EMI performance.
• Low Total Harmonic Distortion: This PFC controller minimizes THD, thereby improving the quality of power and reducing stress on the electrical infrastructure.
• Protection Features: The device includes over-voltage, under-voltage, and over-current protection, ensuring robust performance and longevity of the power supply.
• Minimal External Components: The L4981A requires fewer external components, simplifying design and reducing overall system cost.
• Adjustable Output Voltage: It provides the flexibility to set the output voltage as required for various applications.

The L4981A also features a shutdown function that can be activated via a logic input, allowing for an easy power-down sequence and further energy savings when the PFC is not required. With its advanced functionalities and protective measures, the L4981A is a reliable choice for designers looking to improve power efficiency and performance in their next project.

Overall, the L4981A PFC controller from STMicroelectronics represents a sophisticated solution for modern power supply challenges, combining efficiency, flexibility, and reliability in a compact package.