UCC28019DG4

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The UCC28019DG4 is an integrated power factor correction (PFC) device from the Texas Instruments Precision Power Management ICs family. It combines a PFC controller and a high-efficiency current-mode PFC stage for a wide range of surface-mount power supplies. The device offers a single-stage-to-ground approach to PFC for power ratings up to 200 watts for line voltages above 85 V AC.

The UCC28019DG4 features a current-mode regulator which provides fast transient response, low output ripple, and good form factor factor correction. It also features a voltage-mode controller that provides good line and load regulation, as well as low total harmonic distortion (THD). The device includes protection features such as over-current, over-voltage, and latch-off protections, controlled soft-start, and near-power-good indicator.

Application field and working principle

The UCC28019DG4 is suitable for a wide range of AC line power supply applications such as adapters, fans, motor drives, and industrial systems. The device uses a single-stage-to-ground approach to provide a high-efficiency, low THD power supply with a high power factor across all line voltages.

The device includes a current-mode PFC stage which serves multiple purposes. The first purpose is to direct the appropriate current through the external MOSFETs and inductors. The current-mode regulation ensures that the output power remains constant over the entire AC line range. The second purpose is to provide a counter current to the input current, resulting in a power factor that is very close to unity. The third purpose is to monitor the input current consumption, while providing a signal to the voltage-mode controller to keep the output voltage in regulation.

The voltage-mode controller monitors the output voltage across the main output filter capacitor and maintains constant output voltage over the entire line and load range. The PFC controller also provides an output signal to the external MOSFETs and outputs soft-start, precharge, and latch-off protection signals.

The UCC28019DG4 is designed for high efficiency and excellent power factor correction throughout the entire input line voltage range. It is designed to operate with a low component count due to the internal current-mode regulation and the high input voltage range capability. It also provides protection against over-current, over-voltage, and latch-off events. These features make the UCC28019DG4 a suitable choice for a wide range of AC-line power supply applications that require high efficiency and low THD.

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