UCC28050DR

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The UCC28050DR is a hybrid single-chip Power Factor Correction (PFC) controller integrated circuit (IC) which operates in both a single-stage Boost PFC and a quasi-resonant zero-voltage transition (ZVT) PFC. It is part of Texas Instruments’ Universal Quasi Resonant (UQR) family of power factor correction controllers, which extend the benefits of ZVT PFC to the full range of regulated and unregulated dc-dc converters. The authoritative website of Texas Instruments (TI) provides detailed application information about PFC controllers, such as the UCC28050DR, for use in various applications where power factor correction is crucial.The Boost PFC, or inherent PFC, is a single-stage converter whose function is to take a rectified mains AC supply (typically 380VAC) and convert it to a regulated output with Low Total Harmonic Distortion (THD). It is used for applications where additional power is needed to drive a rectified sinusoidal waveform, such as in the PFC pre-regulator, a step-down DC/DC converter that is used to power a variety of ac-power applications.In the quasi-resonant ZVT PFC architecture, the DC link capacitor-inductor network is replaced by a resonant tank, which is tuned to resonate at the same frequency as the input signal. This helps reduce filtering requirements and voltage spikes, allowing the converter to operate more efficiently. Furthermore, a zero-voltage transition (ZVT) switch is used to turn on the switch device when the resonant voltage has passed through the zero-voltage threshold. This significantly reduces both the switch device losses and the noise generated by the switching operation.The UCC28050DR PFC controller operates in both single-stage Boost PFC and quasi-resonant ZVT PFC architectures. It is designed to be used with two switch power devices, typically two Power MOSFETs, in an H Bridge configuration. It is integrated with a switched-mode power supply (SMPS) controller and pulse-width modulation (PWM) controller, offering many features to support PFC operation for both continuous and discontinuous conduction modes (CCM and DCM).In Boost PFC applications, the UCC28050DR provides control of the boost inductor current in order to keep the power factor close to 1. It also provides soft-start and overload protection features, and is capable of maintaining a constant output voltage when the input voltage varies. It is capable of dynamically adjusting the switching frequency in order to improve efficiency, reduce noise, and reduce peak temperatures.In ZVT PFC applications, the UCC28050DR controller offers several features to support PFC operation in both CCM and DCM. In CCM operation, it is capable of dynamically adjusting the primary current up or down depending on the load demand, and provides control of both the peak and average current. The controller also provides protection against output over-voltage and under-voltage, in order to protect the load from excessive voltage levels.In DCM operation, the controller provides control of the maximum on-time and the resonant frequency, and it also offers both primary and secondary soft-start and overload protection features. The UCC28050DR is capable of load-dump recovery, and of maintaining a constant output voltage when the input voltage varies. The PFC controller also supports pre-biased voltage and current sense applications.The UCC28050DR PFC controller enables high-efficiency and high-precision control of power factor levels, extending the benefits of ZVT PFC to the full range of regulated and unregulated DC/DC converters. Its integrated features provide superior performance in many sophisticated PFC applications, such as server PSUs, switched-mode power supplies, and dc-dc converters.

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