UC3855BDW

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UC3855BDW is an integrated monolithic power factor correction (PFC) controller. It is a self-contained high performance device intended for use as the main control element for boost type switching converters. It is suitable for AC power sources ranging from 85V to 265V. It is used to increase the power factor of AC power sources by controlling the input current so that it is sinusoidal and in phase with the input voltage.

The UC3855BDW offers excellent performance with high bandwidth operation and fast transient response. The device works in discontinuous current mode (DCM) as well as critical current mode (CCM) to meet various PFC requirements. It also provides high efficiency by operating in DCM during light load conditions.

The UC3855BDW features simple loop compensation, leading edge blanking (LEB), and a voltage-mode control scheme. The LEB enables the controller to reject false signals generated by the rectified input voltage. In addition, the voltage-mode control scheme has improved load transient response and line input voltage compensation.

The device also has slew rate limiting and current limiting, as well as an adjustable oscillator and a 0.5% reference. The output stage includes an advanced MOSFET driver with a wide turn-on voltage range of 5V to 7V. The output driver is able to drive power MOSFETs with their gate capacitances up to 200nF.

The UC3855BDW is suitable for a wide range of applications, ranging from consumer electronics to industrial use. It can achieve high power factor, low harmonic distortion and high efficiency when used for PFC applications. In consumer electronics, it can be used to improve the power quality of appliances by reducing the harmonics generated by the power supply. In industrial use, it can be used to reduce the electrical noise created by the AC power source, which can result in better system performance.

In summary, the UC3855BDW offers a high performance, integrated monolithic PFC controller. Its features such as leading edge blanking, slew rate limiting, current limiting and adjustable oscillator, make it suitable for a wide range of power applications. Its voltage-mode control scheme has improved load transient response and line input voltage compensation, offering high efficiency and better power quality.

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