UCC28515DWR

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Power Factor Correction (PFC) is a technology developed to improve the quality and reliability of a power system. Over the years, power system designers have used this technology to improve the efficiency, reduce losses, and reduce emissions from power systems. The UCC28515DWR is one such example of this technology in action.

What is the UCC28515DWR?

The UCC28515DWR is a high-efficiency, synchronous rectification buck-boost Power Factor Correction (PFC) controller developed by Texas Instruments. It specifically targets low-frequency applications with a wide operating-voltage range. This is achieved by utilizing a fixed frequency, valley current-mode-controller method and a custom modulation scheme. The integrated 10V regulator supplies power to the integrated logic and gate driver, eliminating the need for an off-board voltage supply.

Applications

The UCC28515DWR is suitable for use in either buck, boost, or buck-boost applications. It can be used as a PFC stage for 60W and 150W AC-DC converters with input voltages ranging from 85VAC to 265VAC. Since the synchronous rectification allows for high current transfer with low on-resistance, this PFC controller is ideal for high-current applications such as LED lighting systems, televisions, and PC power supplies.

Features

The UCC28515DWR features several features designed to improve the quality and reliability of a power system. The most notable feature of this PFC controller is its fixed-frequency current mode control. This type of control offers fast line and load transient response and high efficiency operation. Additionally, the integrated 10 V regulator, low-noise drive scheme, and analog multiplier enable the PFC controller to operate with decreased power losses and improved power quality. Lastly, the low pin count and reduced number of external components reduce the overall system cost.

Working Principle

The UCC28515DWR works by converting the input AC voltage into a DC voltage, thus creating power factor correction. The AC input is first rectified with a diode bridge, creating an unregulated voltage. This voltage is then regulated by the UCC28515DWR, which features a fixed frequency current mode controller. The controller has two outputs, one for the high-side MOSFET and one for the low-side MOSFET. Each output is controlled and modulated in order to regulate the voltage across the load, thus ensuring a constant output voltage with minimum ripple. This voltage regulation is further improved by the integrated 10V regulator, which provides constant gate drive. Once the initial setup is complete, the controller automatically adjusts itself for line and load transients.

Conclusion

The UCC28515DWR is an advanced and reliable PFC (Power Factor Correction) controller from Texas Instruments. It features a fixed frequency current-mode-controller method and a custom modulation scheme which allows for high efficiency operation over a wide operating-voltage range. This controller is ideal for high-current applications such as LED lighting systems, televisions, and PC power supplies. The integrated 10V regulator and low noise drive scheme enable the PFC controller to operate with decreased power losses and improved power quality.

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