UC3872N

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UC3872N is an advanced peak-current mode controller with PFC. It is suitable for ac/dc switched-mode power supplies and can be used in the fields of ballast controllers and lighting. It provides a flexible, featured design with its built-in digital ramp generator, low-side current sensing, overcurrent protection, and other features to reduce design time and parts count.

Overview

The UC3872N is a peak-current mode controller with PFC, which takes advantage of TI\'s patented peak-current mode architecture for improved system performance and improved efficiency at high switching frequencies. It also features cycle-by-cycle peak current limiting and fast conventional current-mode control loop response. The device has a wide-range operating frequency of 35 kHz to 400 kHz that allows designers to optimize circuit efficiency and noise. It includes a built-in comparative ramp generator and peak-current limit circuit that eliminates the need for external circuitry. The UC3872N also provides flexible control for current mode loop compensation and operating operating frequency. Additional features include overcurrent protection, soft start and low power consumption.

Applications

The UC3872N can be used in a variety of lighting applications such as fluorescent ballasts, LED drivers, halogen lamp drivers, and street lights. It is also used in a variety of ac/dc switched-mode power supplies including switched-mode power supplies for white goods, EMI filters, and several components including relays and regulators.

Working Principle

The UC3872N is a PFC peak-current mode controller that operates in current mode to control the switching frequency of the power converter and to provide constant current sensing. The device uses a ramp signal to compare the peak current with a reference setting to control the peak power allowed. The device includes a bang-bang comparator with cycle-by-cycle peak current limit protection and fast loop response. The built-in digital ramp generator and peak-current limit circuit eliminate the need for external circuitry thus saving space, cost, and design effort. The device also provides flexible control for current mode loop compensation, operating frequency selection, and other features.

Conclusion

The UC3872N peak-current mode controller with PFC is a versatile device that can be used in the fields of ballast controllers and lighting. It provides excellent system performance, improved efficiency at high switching frequencies, and eliminates the need for external circuitry. It also provides flexible control for current mode loop compensation, operating frequency selection, and other features that reduce design time and parts count. Many application fields benefit from the use of this device, such as fluorescent ballasts, LED drivers, halogen lamp drivers, and street lights, as well as a variety of ac/dc switched-mode power supplies.

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