UC3853DTR Integrated Circuits (ICs)

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The UC3853DTR is a part of Texas Instruments Voltage Mode PFC (VMPFC) family of Power Factor Correctors (PFC). This device has been engineered to deliver a constant output current to resistive, capacitive and inductive loads, while keeping the Power Factor Correction at more than 0.95. It achieves this remarkable performance with a high precision and simplicity of design, allowing for a variety of different applications, from conventional ACDC power supplies, motor controls and major lighting, to highly advanced applications in automotive and industrial.The UC3853DTR provides maximum efficiency at the lowest cost of ownership, with the latest technology advances such as integrated driver circuits and pre-regulation, making it simpler and more cost effective to implement a PFC system. Its wide input voltage range, low THD and fast transient response make it suitable for strictly regulated systems.The VMPFC family’s main highlight is its power factor correction and conversion capability. The PFC controller takes rectified, unregulated AC input and performs regulation, to output a continuous, low distortion DC. The output of the device is expressed as the product of the input voltage, the input current and the power factor (PF). The device is a three-stage PFC circuit with two switch control paths. The control elements are typically manipulated in a series of self-adjusting loops, with the end result being a corrected input current waveform with a power factor equal to or higher than 0.95.The two main components of the UC3853DTR are the Power Factor Control (PFC) and the Feedback Loop Control (FLC). The PFC is the device’s primary controller, and generates the switching signals for the buck/boost topology, adjusts the output voltage, and manages the PFC stages. The FLC primarily works to ensure continuous current flow to the load. It is designed to compensate for input voltage variations and reduce the amount of ripple voltage in the output current.The UC3853DTR offers comprehensive diagnostic and configuration features, such as an externally adjustable startup time and deadtime, as well as an output with line feed-forward (LFF).The device’s output is controlled by an internal reference voltage. The reference voltage is adjustable and can be regulated to enhance its power factor value, as well as to set the output voltage. It is possible to regulate the output voltage over a wide range, between 5 V and 32 V. Additionally, the output voltage can be programmed through an external resistor, for more precise output regulation.Overall, the UC3853DTR is a powerful and easy to use PFC device, suitable for a wide range of applications, from conventional ACDC power supplies to highly advanced lighting systems. Its advanced features and low cost of ownership makes it a great solution for designers looking to implement PFC into their designs.

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