The L4981AD-LF from STMicroelectronics is a highly integrated Power Factor Corrector (PFC) designed to construct high performance, low-cost power supplies with improved power factor and lower Total Harmonic Distortion (THD). This device is specifically engineered for use in a wide range of applications that require AC-DC conversion, including but not limited to switched-mode power supplies (SMPS), LED drivers, and energy-efficient power delivery systems.

Key Features

• Continuous Conduction Mode (CCM): The L4981AD-LF operates in Continuous Conduction Mode, which is ideal for applications requiring a high power factor and low THD across a wide range of load conditions.
• High Integration: This PFC controller integrates numerous features such as soft-start, overvoltage protection, and under-voltage lockout, reducing the need for external components and simplifying the design process.
• Frequency Modulation: To minimize electromagnetic interference (EMI), the device includes frequency modulation, spreading the noise energy over a wider bandwidth.
• Multi-Protection Features: The L4981AD-LF is equipped with various protection features, including overvoltage, undervoltage, overcurrent, and thermal shutdown, ensuring robust performance and reliability in the field.

Applications

• AC-DC Adapters
• Power Supplies for Desktops and Servers
• LED Lighting Systems
• Flat Panel Displays and Televisions
• Industrial Power Systems

Technical Specifications

The device supports a wide input voltage range and can operate at high switching frequencies, allowing for smaller passive components and a more compact overall design. It is available in a 16-pin SO package, making it suitable for PCB layouts with limited space.

Conclusion

STMicroelectronics' L4981AD-LF is a versatile and efficient solution for power supply designers looking to meet stringent energy requirements while maintaining cost-effectiveness. Its integrated features and protection mechanisms make it a reliable choice for a diverse array of electronic products.