UCC3817DTRG4

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The UCC3817DTRG4 Power Factor Correction (PFC) controller is a high-performance integrated circuit (IC) designed to efficiently achieve power factor correction in applications operating from 115-265 Vac. This device is a part of Texas Instrument’s UCC38xx family of controllers, which utilizes a synchronous rectification charge pump for improved power efficiency. The UCC3817DTRG4 offers a solution for the power requirements of systems including high-power industrial, consumer, and telecom applications.

The UCC3817DTRG4 application field ranges from lighting dimmers and white goods to voltage sources, audio amplifiers, and active rectifiers. In addition, the UCC3817DTRG4 can be used in combination with a synchronous buck controller to construct DC-to-DC converters. Its power factor and efficiency make this device suitable for a variety of power-conversion requirements.

The UCC3817DTRG4 works utilizing the high power factor correction methodology. It works to correct the distorted current sine wave caused by a varying load. As the load changes, the controller will adjust the power factor by modulating the voltage output of the Power Factor Controller (PFC) circuitry in order to maintain a nearly sinusoidal input current waveform. The controller works by receiving an input voltage from the power source and then generating a constant rectified output voltage that is phase-shifted in relation to the input voltage.

The controller includes several features to ensure efficient power factor correction. This includes a built-in, constant current control loop, as well as an oscillator and timer for pulse width modulation (PWM) of the main switching element. Additionally, the UCC3817DTRG4 utilizes an adaptive on-time control to recognize load changes and respond quickly to ensure optimal power efficiency. This controller also provides a fault latch extraction circuit, which latches off the PFC, and a soft start feature that prevents overshoots, as well as slew rate control to prevent inrush currents.

The UCC3817DTRG4 is a highly efficient, low-cost solution for power factor correction. This device provides an output voltage that is precisely controlled, while still ensuring efficient power conversion and avoiding power losses. Furthermore, the device is easy to design-in, making it ideal for applications that require a reliable, high-performance power factor correction solution.

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