STMicroelectronics

L4981A

L4981A Description

The L4981A is a high-performance, average current mode, PFC (Power Factor Correction) controller IC designed and manufactured by STMicroelectronics. This through-hole mounted device operates within a supply voltage range of 14.5V to 19.5V and offers a switching frequency of 100kHz. The L4981A is designed to provide efficient power conversion and is suitable for a wide range of applications requiring high power factor and low harmonic distortion.

L4981A Features

• Average Current Mode Control: The L4981A employs average current mode control, which offers several advantages over other control techniques, including better stability, faster transient response, and reduced sensitivity to component variations.
• Wide Supply Voltage Range: With a supply voltage range of 14.5V to 19.5V, the L4981A can operate under various input conditions, making it suitable for a wide range of applications.
• 100kHz Switching Frequency: The L4981A's 100kHz switching frequency allows for compact design and high efficiency, making it ideal for applications where size and efficiency are critical.
• Low Startup Current: The L4981A has a low startup current of 100 µA, which reduces power consumption during startup and extends the lifetime of the power supply.
• REACH Unaffected Status: The L4981A is classified as REACH unaffected, meaning it does not contain any substances of very high concern (SVHCs) listed under the European Union's Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) regulation.
• Moisture Sensitivity Level (MSL) 1: The L4981A has an MSL of 1, indicating that it is not sensitive to moisture and can be stored and handled without special precautions.

L4981A Applications

The L4981A is ideal for a variety of applications where high power factor and low harmonic distortion are required. Some specific use cases include:

1. AC-DC Power Supplies: The L4981A can be used in AC-DC power supplies for various electronic devices, such as computers, servers, and telecommunications equipment.
2. LED Lighting: The L4981A is suitable for LED lighting applications, where high efficiency and low harmonic distortion are essential for long LED life and reduced energy consumption.
3. Industrial Power Supplies: The L4981A can be used in industrial power supplies, where high power factor and low harmonic distortion are required to meet regulatory standards and ensure reliable operation.
4. Battery Chargers: The L4981A can be used in battery chargers for electric vehicles and other applications, where high efficiency and low harmonic distortion are critical for battery life and performance.

Conclusion of L4981A

The L4981A is a versatile and high-performance PFC controller IC from STMicroelectronics, offering average current mode control, a wide supply voltage range, and a low startup current. Its REACH unaffected status and moisture sensitivity level of 1 make it suitable for a wide range of applications, including AC-DC power supplies, LED lighting, industrial power supplies, and battery chargers. While the L4981A is now considered obsolete, it remains a reliable and efficient solution for applications requiring high power factor and low harmonic distortion.