UCC28521DW

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Power Factor Correction (PFC) is one of the most important components in the design of power supply and electrical power management systems. It reduces harmonic distortion of the current waveform in order to improve the efficiency, lifespan and stability of the system. PFC also reduces the amount of reactive power drawn from the utility, thus reducing the demand charges that apply to large facilities.The UCC28521DW is an integrated PFC controller from Texas Instruments, specifically designed for power factor correction (PFC). It is a high-performance controller with an integrated high-voltage startup device to quickly bring the PFC converter to power-on mode. UCC28521DW also integrates an N-channel MOSFET and a logic block, which allows it to accommodate a variety of design parameters.UCC28521DW has a wide range of applications in motor drives, solid-state lighting and power supplies. It supports a variety of power topologies, including buck, boost, buck-boost, forward and flyback PFC converters. With its high-speed digital control loop, it can provide excellent power factor and line regulation with only a few external components. Its built-in voltage detection enables it to provide feedback on the input voltage, enabling it to protect the system from overvoltages. This also allows it to be used in multi-stage systems that require flexible voltage ranges.The UCC28521DW is an integrated PFC controller that operates in the discontinuous conduction mode (DCM). The controller consists of a power stage and a control stage. The power stage consists of an N-channel MOSFET for the main switch and a discrete diode for freewheeling. The control stage consists of an oscillator and a current sense circuit.The oscillator generates the switching frequency, which can be adjusted to optimize the power factor. The current sense circuit measures the inductor current and controls the duty cycle of the MOSFET switch. The duty cycle is adjusted such that the input current waveform is close to the sinusoidal waveform. This increases the power factor, improves the energy efficiency and reduces harmonic distortion in the power line.The UCC28521DW is ideal for a wide range of devices that require high efficiency and superior power factor correction. Its digital control loop enables it to cope with power line disturbances and transient loads. It is compatible with a variety of AC input levels, allowing it to be combined with a wide range of power stages to achieve high efficiency and power factor correction. This makes the UCC28521DW a popular choice for power factor correction in a broad range of applications.

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