UCC3818DTR Integrated Circuits (ICs)

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PMIC (Power Management Integrated Circuit) is a very important category of integrated circuit technology, and PFC (Power Factor Correction) is a prominent feature of PMIC technology. This article focus on the UCC3818DTR, a highly integrated PFC integrated circuit and will elaborate the applications and working principle for this device.

UCC3818DTR Application

The UCC3818DTR device is a direct AC/DC offline active PFC controller that can be used in a variety of applications. It is typically used in power supplies with a power rating up to 1080 W such as air conditioners, refrigerators, electric fans, and other home appliances. The UCC3818DTR provides superior active current-mode PFC and helps to achieve a wide range of power factor operations over the whole input line voltage range. The UCC3818DTR also comes with enhanced protection features that include an automatic overload protection (OLP) and a fast overcurrent protection (OCP). Additionally, the device can be used together with an on-off controller to form a complete AC/DC converter system with total system solution cost reduction.

UCC3818DTR Working Principle

The UCC3818DTR is a power factor correction device that utilizes the active-PFC (Power Factor Correction) technology to provide better performance, higher efficiency and longer lifetime. The power factor (PF) of a circuit operating in the active-PFC mode is higher than that of a circuit operating in the passive-PFC mode. The power factor of a PFC circuit is defined as the ratio of the real power to the apparent power. The UCC3818DTR is an integrated low-cost power factor correction (PFC) controller with a built-in control circuit. The PFC control circuit monitors the input voltage and ensures that the power factor remains close to unity. When the power factor falls below a certain point, the control circuit sends out a signal to a switching element, such as a switch mode power supply (SMPS) or a rectifier bridge, to adjust the current in the circuit.When the power factor is below a pre-set threshold, the UCC3818DTR compensates the reactive power by drawing more current until the power factor returns to near unity. The process is repeated continuously to maintain the desired power factor. Additionally, the device also provides over-voltage and over-temperature protection to ensure safe operation.

Conclusion

The UCC3818DTR PFC IC enables an AC/DC offline active PFC controller, with enhanced protection features and wide range of power factor operations. It is suitable for power supplies with power ratings up to 1080 W. Additionally, the PFC control circuit ensures that the power factor of the PFC remains close to unity through continuous monitoring of the input voltage. Thus, it is a highly efficient and cost-effective solution for various home appliances.

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