PFS7629L

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Part Status:	Active

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Introduction

PMIC - PFC (Power Factor Correction) is a technology used to increase the efficiency of power delivery systems. It is widely used in industrial and commercial applications, including the operation of electric motor drives, HVAC equipment, and large-scale power plants. In the power supply area, it is used to make a more efficient use of energy and reduce transmission losses.One of the most prominent PFC solutions is provided by Fairchild Semiconductor, a leading manufacturer of integrated circuits, through its flagship PFS7629L power factor correction IC. In this article, we\'ll look at the application field and working principle of this device.

Application Field and Working Principle

The PFS7629L is designed for AC/DC non-isolated power factor correction (PFC) applications, operating from an input voltage range of 85-265 VAC. It features a built-in current mode control and a fixed switching frequency of 35 kHz, which can be adjusted over a wide range (14.2kHz to 75kHz).The PFS7629L provides a maximum output power of up to 120W and has a patented adaptive frequency modulation (AFM) technique that enables the adjustment of the switching frequency automatically according to load variations. This reduces the power dissipation and minimizes the system noise.The device also features an integrated synchronous doubler rectifier with soft-start and overload protection, making it suitable for harsh power supply environments. It also features integrated PFC LED dimming control for single LED-string applications.The working principle of the device is based on the power factor correction controller, a comparator-based circuit whose input and output indicate the current level of the power source. The controller measures AC line voltage and compares it to the DC output voltage. If the output voltage is low, the comparator signals the PFC controller to increase the frequency of the line-side AC switch until the input-side current reaches a desired level. When this level is reached, the AC line switch is operated at a fixed frequency to maintain a constant power factor, and the output rail is regulated by active H-bridge control. The output is then regulated depending on the level of the input voltage, meaning that if the voltage goes up, the output voltage is decreased and vice versa.

Conclusion

The PFS7629L is an ideal solution for power factor correction applications with a wide range of applications such as AC motor drives, HVAC, and large-scale power plants. Its features allow for efficient and reliable operation in harsh power supply environments, and its patented AFM technique makes it highly adjustable and customizable. This device is capable of providing a maximum output power of up to 120W, and it also features integrated PFC LED dimming control which is ideal for single LED-string applications. Its comparator-based power factor correction controller allows for easy monitoring and regulation of the power source and its output, making it a more efficient and reliable choice for many different types of applications.

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