UCC2818ADG4

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Power Factor Correction (PFC) is the process of adjusting an AC electric system’s power waveform such that it is as close to sinusoidal as possible, by taking advantage of the fact that most common electric appliances and equipment are designed to run best on sinusoidal power waveforms. The UCC2818ADG4 is a power factor correction chip from TI that is widely used in PFC applications. This article describes the features, application field and working principle of this device.

Features of UCC2818ADG4

The UCC2818ADG4 is a low-cost, high-performance, single-stage PFC controller with integrated low-side MOSFET gate drivers. It is implemented using a standard CMOS technology, which makes it one of the most budget-friendly options among PFC controllers. This device has a wide operating voltage range of 8V-400V, and the switching frequency can be adjusted from 15kHz to 250kHz. Additionally, it has an integrated power-good signal output and a programmable soft-start feature that improves reliability and efficiency. Additionally, it has integrated short-circuit protection and over-current protection, making it suitable for powering heavy loads. Moreover, it has a light-load detection output, which can adjust the power supply efficiently when the load is below a certain threshold.

Application Field

The UCC2818ADG4 is a versatile PFC controller with a wide range of applications. It can be used in both flyback and forward converters to improve the power factor of lighting systems, industrial heaters, off-line power supplies, motor control systems, renewable energy sources and AC-DC conversion circuits. Additionally, this device can also be used in AC-DC offline SMPS, where it helps reduce the total harmonic distortion of a system. Moreover, it can be used as part of a larger power system architecture, such as a bridge rectifier with a buck converter, to boost performance and improve efficiency.

Working Principle

When powered on, the UCC2818ADG4 immediately begins operating. The device senses the input voltage and current, and compares the two to determine the power factor. If the power factor is below the desired value, the device begins to adjust the width of the gate pulse for the MOSFETs in the converter, so that the voltage and current are in phase. This adjustment of the gate pulse width helps increase the power factor of the system, thus improving its efficiency. When the power factor reaches the desired value, the device stops making adjustments. Additionally, the device can adjust the switching frequency to improve efficiency for light loads. This helps ensure that the system performs optimally, regardless of the load.

The UCC2818ADG4 is a cost-effective, feature-packed PFC controller from TI. It has an optimized design, and its integration of MOSFET drivers and protection features make it particularly suitable for powering heavy loads. Additionally, its ability to adjust the pulse width and frequency make it an ideal choice for efficiently powering light loads. This device is an all-in-one solution for PFC, and is well-suited for a wide range of applications in bridge rectifier and buck converter based systems, industrial heaters and lighting systems.

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