UCC2817PW

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Power Factor Correction (PFC) controllers are an integral part of the power management industry. PFC controllers are designed to ensure the efficient operation of end-use electronic systems and reduce energy waste. The Universal Current Controller (UCC) 2817PW is a high-performance PFC controller that is designed to provide efficient, reliable, and economical solution for AC-DC power systems. This paper aims to discuss the application field and working principle of the UCC2817PW.

The UCC2817PW is equipped with a high-performance 180° phase-shift PFC algorithm to achieve highest efficiency and meet most of the stringent international regulations. This controller is suitable for all topologies of PFC converter, including Boost, Boost with Transformer, Flyback, Boundary-Conduction Mode (BCM/CCM) and Single-Stage Resonant. With the adaptive dead-time control and valley-fill technology, it enables faster output current response and extremely low current ripple under the condition of minimum waveform distortion. The UCC2817PW is integrated with current and voltage loops and can provide rapid dynamic response and smooth overshoot-free transient performance. Moreover, the controller features the programmable over-temperature protection, low and high line input protection, soft-start/hiccup and brown-in/brown-out protection to power a wide range of AC-DC applications. Additionally, the built-in system interface provides protection monitoring, is capable of communicating with the external MCU and provides power-good signal.

The UCC2817PW is easy to use and suitable for applications with a power ranging from 300W to 2000W. This controller is built to lower the system implementation cost, with few external components required, and operates off a standard voltage rail ranging from 7V to 40V and can support input voltage up to 264Vac. Also, the controller allows precision current regulation control and utilizes a valley-fill technique to increase system power density. Additionally, the UCC2817PW has a wide output current range up to 26A peak and provides programmable voltage and current sensing compromise, embedded into the PFC controller for fast response. Furthermore, the built-in system interface allows analog, digital, and multi-phase control with wide range of output voltage requirements.

The UCC2817PW operates as an oscillator and Error Amplifier based PFC. It will first generate a triangle waveform, which is compared to an error amplifier with a set point of 1. The output voltage of the error amplifier is then compared to the triangle waveform and used to drive the power MOSFET switch to regulate the power factor of the power system. The controller is equipped with the current sense comparator, which monitors the output current and, if high compared to the reference, will shut down the power stage until the source current is within the specified limits. The UCC2817PW offers a number of features and benefits to ensure the efficient and reliable operation of power systems.

In conclusion, the UCC2817PW PFC controller provides an efficient, reliable, and economical solution to AC-DC power systems. It is easy to use and operates with few external components required. The controller is equipped with a high-performance 180° phase-shift PFC algorithm that ensures the highest efficiency and meet most of the stringent international regulations. The UCC2817PW is integrated with current and voltage loops and can provide rapid dynamic response and smooth overshoot-free transient performance. Additionally, it has a wide output current range and provides programmable voltage and current sensing compromise. With its wide input voltage range, exceptional performance, and powerful feature set, the UCC2817PW is the ideal choice for designers when looking for an optimal and reliable PFC solution.

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