UCC3818NG4

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Power Factor Correction (PFC) is an important element of a typical electronic power system design. It helps to ensure that the desired input power waveform is achieved at all times, making the overall efficiency of the system more efficient and helping to reduce the amount of power lost in the power supply. The UCC3818NG4 is an integrated PFC controller that enables a number of power factor correction applications.

Overview of UCC3818NG4

The UCC3818NG4 is an integrated PFC controller designed to enable a wide range of power factor correction applications. It features a low-side integrated power MOSFET gate drive in a mono-voltage configuration, as well as an integrated high-voltage start-up and over-voltage protection circuit. It also features an active current limit function, enabling the controller to limit the current flowing into the load.

The UCC3818NG4 is designed to operate with an input voltage range of 200V to 465V and a switch output voltage range from 65V to 350V. The device is rated for up to 600-kilo watt operation in a typical application.

Applications of UCC3818NG4

The UCC3818NG4 is ideal for a wide range of PFC applications, including ac-dc conversion for telecom and landline power supplies, switching power supplies, and motor drive applications. The device is capable of operating in either unified or phase shifted power factor correction mode, and can be used in ac, dc, or phase shifted applications to achieve power factor correction efficiency.

The UCC3818NG4 is also suitable for lighting and solar applications. In lighting applications, the controller can be used to provide stable, consistent brightness levels in applications such as streetlighting and architectural lighting. In solar applications, the controller can be used to regulate the voltage and current of solar panels, as well as providing protection for the system in the event of an overload.

Working Principle of UCC3818NG4

The UCC3818NG4 is a current mode controller, meaning it monitors and controls the output current of the power factor correction circuit. The controller takes an input voltage, which the IC then compares to the voltage sensed at the output of the circuit. If the voltage across the power factor correction circuit exceeds a predetermined limit, the controller will activate the internal power MOSFET gate drive, turning off the output.

The controller then measures the output current and adjusts the voltage input to maintain a constant output current. If the current exceeds a predetermined limit, the controller will shut off the gate drive and reduce the power supply output until the correct current is detected. This helps to ensure that the power supply remains in safe operation at all times.

Conclusion

The UCC3818NG4 provides a reliable, efficient solution for power factor correction applications. The integrated power MOSFET gate drive allows for precise and accurate regulation of the output current, while the high-voltage start-up and over-voltage protection circuitry ensures that the system is operated safely and within its given limits. This integrated controller is an ideal solution for a wide range of power factor correction applications.

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