UCC2817D

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The UCC2817D is a monolithic Power Factor Correction (PFC) device from Texas Instrument (TI) widely used in industrial and commercial applications. It is designed to maintain power factor, reduce power loss and provide a stable output voltage. The UCC2817D is built around a cascoded PFC circuit that is supported with a comprehensive package of analog and digital components in addition to a window detect circuit. This unit provides it users with a PFC solution in one single chip and eliminates the need for complex and expensive external circuits.

The main application of the UCC2817D is to control alternating current (AC) power and maintain the power factor close to one. This is also known as active or dynamic power factor correction. The UCC2817D effectively reduces power line disturbances and provides a clean, regulated and stable current supply to protect other sensitive loads from damaging transients or inductive surges.

The UCC2817D has an operating frequency range from 20 kHz up to 150 kHz depending upon the load type and input line. A unique Zero Voltage Transition (ZVT) topology is used to reduce line and load noise and can regulate a range of input voltages with output current levels up to 10A.

The UCC2817D works by monitoring the input voltage and then controlling the switch on/off times to adjust the power factor and output voltage. A continuous current output is possible by monitoring the output current and controlling the current limits accordingly. The digital core of the UCC2817D includes an integrated microcontroller, window comparator and programmable compensation. This allows it to accurately control the power factor over the complete load range.

The UCC2817D offers other features like low harmonic distortion, feedback control, zero current switching and low standby power for improved system efficiency. In addition, it offers a range of safety features such as over voltage, over current, over temperature and output short circuit protection.

In summary, the UCC2817D from TI is a highly advanced PFC chip designed for applications that demand precise control of power. It offers easy installation, improved efficiency and excellent protection capabilities. The PFC technology employed with the UCC2817D provides stability and reliability in power delivery and can greatly reduce the threat of line noise interference.

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