UCC2819N

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Power Factor Correction (PFC) is a key component in power supply systems, providing improved power quality, higher efficiency, and greater system reliability. The UCC2819N is a high integrated power Factor Control (PFC)-based controller specifically designed to reduce the size and cost of high power factor, low harmonic voltage rectifiers. In this paper, we will discuss the application field and working principle of the UCC2819N.

Application Field

The UCC2819N is a high-performance, cost-effective integrated controller for power factor correction and voltage regulation. Its high level of integration, low system cost, and high reliability make it ideal for a wide range of applications, including:

• Power supplies for consumer electronic products
• Power supplies for computing, printing, and office equipment
• Industrial and security system power supplies
• Inverters for motor drives and other motor-driven systems
• Grid-connected AC/DC power supplies
• UPS systems and other stand-by power supplies

Working Principle

The UCC2819N\'s power factor correction controller is based on a fixed frequency constant current control architecture, with an impedance-based voltage reference compensation technique that eliminates the need for an isolated voltage reference. It uses an optimized digital control loop in order to provide accurate and fast response time. The controller also includes a wide range of protections, such as over-voltage, over-temperature, under-voltage, over-current, and open-loop protection.

At start-up, the controller monitors the DC bus voltage and adjusts the power switch on time to generate a substantially constant current in order to improve the power factor. As the DC bus voltage increases, the controller compensates for the voltage drop across the input rectifier diodes, resulting in higher output power. The controller regulates the output voltage by controlling the duty cycle according to the level of the DC bus voltage and by monitoring the peak current of the rectifier diodes.

The controller also provides several features to protect power supply systems against faults and out-of-limit conditions. The controller monitors the input voltage, rectifier peak current and rectifier voltage, output voltage and current, and temperature. In the event of any of these out-of-limit conditions, the controller will shut down the power switch and reset once the conditions return to normal.

Conclusion

The UCC2819N integrated controller is an ideal solution for a wide range of applications requiring power factor correction and voltage regulation. Its high level of integration and reliability make it a cost-effective solution for many power supply systems. Its optimized digital control loop and wide range of protections ensure safe and reliable operation in any environment.

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