PFS7326H

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PFS7326H application field and working principle

Power Factor Correction (PFC) is a technique used in power supplies to improve the quality of the power delivered to electrical devices. PFCs are used in a range of applications and vary in complexity to match the needs of the system. Many power supplies require PFC to reduce inrush current, increase power efficiency and improve power quality. PFC is especially beneficial for commercial and industrial applications where high efficiency and power quality are necessary. The PFS7326H is a PFC Controller specifically designed to provide high power performance and operational convenience.

PFS7326H is an integrated PFC controller which provides high-performance power factor correction and energy conversion. The device is suitable for both n-channel and p-channel power factor correction and ballast applications. It contains a quasi-resonant controller, a low-side MOSFET, a high-side MOSFET and a power switch with a cmos protected gate, as well as a temperature sense diode, an operating voltage reference and a precision smps, enabling a complete and compact PFC solution.

The excellent power performance of the PFS7326H ensures low EMI and high efficiency, making it an ideal choice for applications such as ballasts, white goods, home appliances and telecom equipment. The PFS7326H is able to work in a wide input voltage range of 90V-265V AC, allowing for a wide range of input: power factor correction, power conversion and conversion efficiency optimization, as well as high-current peak pulse and droop current mode support.

The working principle of the PFS7326H is based on the fact that it combines a quasi-resonant and soft switching controller with a low side MOSFET and a high side MOSFET. The quasi-resonant controller generates switching signals according to the input voltage, whereas the low side and high side MOSFETs are responsible for turning on and off the output bridge circuit. The switching action of the PFS7326H ensures an accurate, low noise and low distortion power factor correction that reduces the inrush current.

The PFS7326H incorporates a number of features designed to optimize power performance. It provides external compensation support for both peak current mode and droop current mode, enabling the user to optimize the loop stability and reduce noise interference to the input power line. Additionally, the PFS7326H includes a temperature sense diode that helps in monitoring the output bridge temperature and reducing the output power accordingly.

The PFS7326H also includes additional features such as input voltage monitoring, burst-mode operation, sleep-mode operation and internal fault protection. The input voltage monitor feature enables the system to respond to changes in the input line voltage, allowing for improved power performance with low output voltage variation. The burst-mode operation helps to reduce energy consumption when the load is low and the sleep-mode operation ensures a low quadrant power dissipation when the load is high.

In summary, the PFS7326H PFC is an integrated device designed to provide high power performance and operational convenience. The device includes a quasi-resonant controller, a low side MOSFET, a high side MOSFET and a power switch with a cmos protected gate as well as a temperature sense diode, an operating voltage reference and a precision smps, making it a complete and compact solution for PFC applications. Its wide input voltage range and multiple features provide high efficiency, low noise, low distortion and improved power performance, making it an ideal choice for ballast, white goods, home appliances and telecom equipment.

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