UCC3817N

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UCC3817N is a chip used in power factor correction. The purpose of using this chip is to reduce the input current distortion by actively regulating the power factor of the power supply. This is achieved by precisely controlling the average input current so that it is in-phase with the voltage across the input, which then maximizes the power utilization efficiency.

The application field of the UCC3817N mainly focuses on switch-mode power supplies, AC and DC motor drives, and high-frequency power converters. It is designed to provide superior dynamic performance with reduced component count and to limit excessive in-rush current when startup.

The UCC3817N is a voltage-mode control PFC controller that uses an inductor in the feedback loop. It has current limited driver and a low-side MOSFET gate driver, which minimizes the number of components for power supply applications.

The working principle of the UCC3817N lies in the process of power factor correction. When the input is at a lower power factor, the UCC3817N will raise the power factor by controlling the voltage of the load. During the power factor correction process, the chip monitors the current and voltage and regulates them accordingly by adjusting the hadjust input. This allows the higher power factor to be maintained.

In addition to the power factor correction, the UCC3817N also offers a number of other features that make it an ideal choice for power factor control applications. These features include a fast crowbar comparator, a low-temperature-coefficient voltage reference, pre-biased start-up, and low-voltage operation. These features reduce component count, lower power consumption, and improve the overall efficiency of the design.

The UCC3817N is an ideal solution for many power supply designs that require improved power utilization and high efficiency. Its highly reliable operation and precise control allow it to deliver precise power factor correction and efficient operation. This makes it a popular choice for many power supply designs.

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