UCC28060D

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The UCC28060 is an iconic pulse-width modulation (PWM) controller operated by Fairchild Semiconductor and designed primarily for high power factor correction. The integrated circuit offers superior performance, superior flexibility and efficiency, and advanced safety features for a wide range of switched-mode power supplies and power factor correction (PFC) applications. This article will delve into the application fields of the UCC28060 and the principle for operating a PFC converters.

Overview

The UCC28060 is a low-voltage, multi-phase PFC half-bridge PWM controller, specifically designed for single-stage, PFC pre-regulator applications. It features a complete set of safety features to control line voltage, line voltage ripple, over-voltage protection, under-voltage protection, and open circuit protection. It has a wide switching frequency range of 10Hz to 250kHz, enabling it to operate at high demanding, which results in higher efficiency and faster transient response. The controller also supports operating temperature range of -40°C to +125°C, making it suitable for various industrial, commercial, and residential applications.

Application Field

The UCC28060 device is a popular choice for many single-stage PFC converter cultures. It is widely used in advanced AC/DC power supplies like universal AC adapters, desktop power supplies, notebook power supplies, as well as enterprise level power systems. The device is also suitable for offline AC/DC power converters, like single-stage PFC pre-regulation and power factor correction state applications. Being a reliable and efficient device, the UCC28060 can be used in a wide range of AC/DC applications, including those that demand safety features, held at the primary rectification stage. Examples of applications where the device could be used include: dimmable LED driver, power supplies for printer and scanners, set-top box, telecom power supply, automotive converter, as well as active power-factor-corrected lighting products.

Working Principle of PFC

A PFC converter is typically a circuit that attempts to correct the input power of a nonlinear load to deliver sinusoidal current that is within the same phase as the input voltage. The converter ensures the power factor of the system is within accepted limits, minimizes harmonic distortion due to the load current, and reduces the reactive power in the system. This helps to reduce the peak power of the system and reduces the size of the transformers and filtration circuitry, resulting in a more efficient power conversion scheme.

The basic operation of a PFC converter involves the sampling of current, generally at the input point or at the output of the converter, in order for an accurate value to be obtained. The input current is then compared against the input voltage and a proportional error signal is then generated. This error signal is then used to regulate and control the output of the converter, so as to maintain a sinusoidal input current that is within the same phase as the input voltage.

This control action is generally achieved by varying the pulse width of the power converter, with a higher duty cycle indicating higher output voltage. The converter can be set to Constant Voltage (CV) mode or Constant Current (CC) mode, depending on the application. In CV mode, the converter maintains a constant output voltage as the input current varies, while in CC mode, the output current is fine-tuned in order to maintain a constant output current.

The UCC28060 PWM Controller is capable of implementing both CV and CC mode,and provides all the necessary safety features to ensure safe, reliable operation. It has a wide switching frequency range of 10Hz to 250kHz, meaning it is suitable for AC/DC buck or boost converter applications. The controller also has integrated MOSFET drivers, making it easier and simpler to design a power factor correction converter.

Conclusion

The UCC28060 PWM Controller is a capable and reliable device that is specifically designed for PFC converter applications. It has a wide switching frequency range, integrated circuitry, and a variety of safety features that make it suitable for a wide range of AC/DC applications. The integrated circuit can be used to implement both CV and CC mode and is ideal for power conversion efficiency and power factor correction.

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