L6668

The L6668 is an off-line single-stage PFC controller for high-performance light industrial applications. It is designed to meet the growing demands for higher power, efficiency and power factor, while reducing the overall size and cost of the power system. The L6668 is manufactured using a highly integrated and proprietary process that allows it to reach high levels of performance and reliability.

L6668 has a wide application field, such as power distribution systems, power supplies, solar power systems, lighting systems and industrial motor drives.

It can be used to switch power between an AC power source and a low voltage DC source, providing high efficiency and low heat output. The L6668 can also be used to control the output voltage of a DC power supply. By using the integrated PFC (Power Factor Correction) function, the L6668 can provide a higher power density and improved regulation performance. The controller is designed to operate in high temperatures and is capable of providing comprehensive protection for components used in off-line applications.

In terms of its working principle, the L6668 consists of a fixed frequency current-mode control loop and two voltage-mode control loops. The two voltage-mode control loops allow for a wide range of operating frequencies, from under 20kHz to over 400kHz. The current mode control loop is used to regulate the output voltage by controlling the on-time of the power conversion stage. The voltage mode control loop provides the necessary feedback to the current control loop, allowing for improved regulation and power factor improvement.

The device also features various protection features, such as over voltage, under voltage, over temperature and over current. The over temperature protection feature is especially useful for applications that require high reliability.

Overall, the L6668 is a very robust and reliable device for a range of applications in the power electronics industry. The device offers high levels of efficiency, power factor and reliability at a very competitive cost. It is suitable for a range of light industrial applications, including power distribution systems, power supplies, solar power systems, lighting systems and industrial motor drives.