UCC3819AD

UCC3819AD Application Field and Working Principle

UCC3819AD is a monolithic, high-voltage, isolated integrated circuit specifically designed for use as an offline power factor correction (PFC) controller. It is designed to operate throughout the entire range of input voltage supplied to a ballast, while providing power factor correction. The UCC3819AD\'s enhanced features make it ideal for the ballast and lighting control industry.

Application Field

The UCC3819AD can be used in a wide variety of power factor correction applications, such as lighting controls and ballast applications. It is suited for constant-current and constant-voltage applications for both AC line-frequency input and DC output operations. The UCC3819AD\'s powerful control capabilities make it ideal for controlling multiple output configurations. It is also suited for use in applications that require rapid switching, such as LED dimmers, LED backlamps, and LED flashlights.

Working Principle

UCC3819AD uses a high-voltage, switch-mode power factor correction approach to achieve a nearly unity power factor. It employs a non-linear switching technique that reduces the switch-mode voltage ripple and provides improved efficiency. As a result, the power factor correction can be achieved with minimum power loss and high efficiency. The high-voltage, pulse-width-modulated (PWM) approach maximizes the efficiency of the switch-mode operation and allows UCC3819AD to operate without external components, such as inductors and capacitors. The switching frequency can be varied up to 250 kHz, allowing for higher output power and faster transient switching performance.

The UCC3819AD includes a synchronous rectifier (SR) which automatically turns off the MOSFET switch whenever the output is not being used, resulting in improved light efficiency, greater efficiency, and better reliability. A feedback loop and voltage signal processor (VSP) allow the UCC3819AD to constantly monitor and adjust the power factor, as well as the output voltage and current. The feedback loop is designed to continuously monitor the line voltage, output voltage, and the current delivered to the load, and adjust the drive signal accordingly.

Conclusion

UCC3819AD is a high-voltage, isolated integrated circuit specifically designed for use as an offline power factor correction (PFC) controller. Its high-voltage, switch-mode power factor correction approach provides improved efficiency and greater power factor correction. It also includes a synchronous rectifier, feedback loop, and voltage signal processor, which allow for continuous monitoring and adjustment of the power factor, as well as the output voltage and current. Its enhanced features make it ideal for the ballast and lighting control industry.