UC2871N

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UC2871N is an integrated high performance off-line switching power supply circuit. It is one of the lighting, ballast controller products of STMicroelectronics, dedicated to the design of high efficiency and low cost offline LED and CFL lighting applications, and is the ideal lighting, ballast control circuit for applications such as LED lighting, LED lighting, lighting and outdoor lighting. This application field and its working principle are described in detail below.

Application Field

The UC2871N is a high performance, low cost off-line switching power supply controller. It is dedicated to lighting and ballast control applications. With the on-chip dedicated current loop, integrated cycle-by-cycle current limiting circuit, dimming circuit and overvoltage protection circuit, the UC2871N can accurately control the output current of a wide range of output power levels, meet strict EMI and safety standards, and provide a high quality, safe and cost-effective solution for lighting and ballast control applications.

Working Principle

The UC2871N is designed to accurately control the output current of a wide range of output power levels while meeting strict EMI and safety standards. In a typical application, the UC2871N is driven by an external PWM controller and a lamp current sensing circuit. The PWM controller (duty cycle) sets the average lamp current and dimming control the lamp illumination level. The current sensing circuit uses a low-Rdson current sense resistor to monitor the output current of the lamp and send the voltage drop across the current sense resistor to the UC2871N. The UC2871N uses the voltage drop to compare with the sense current level and set the PWM duty cycle accordingly.

The UC2871N is equipped with an integrated cycle-by-cycle current limiting circuit to avoid current overload. This is achieved by monitoring the time duration of the current sensing signal above the trip point and limiting the output current within the protection range. The UC2871N features an adjustable overvoltage protection circuit to prevent voltage spikes. The UVLO and soft start circuit ensures that the lamp is powered reliably and quickly.

The UC2871N is an ideal choice for designing cost-effective and efficient LED and CFL lighting and ballast control applications. With its integrated features, low cost and high performance, the UC2871N can meet various lighting and ballast control applications with high safety and efficiency.

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