PFS7524H

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Power Factor Correction (PFC) is a technology used to ensure that the current and voltage between devices remain in phase. PFC is a type of power-conditioning circuitry that assists with maintaining a specified load or power factor by reducing irrelevant harmonics or other factors that can affect the load and power factor. PFC is used to help regulate voltage, reduce power losses due to electromagnetic interference (EMI), and increase power efficiency.

The PFS7524H is a monolithic CMOS PFC controller IC, designed to be used in AC/DC converters and switching power supplies. It features advanced features like auto-restart, soft-start, current fold-back, over/under voltage/temperature protection and many more, making it a dependable system controller. The PFS7524H’s flexibility makes it suitable for both high and low power applications. It operates up to 500 KHz and is capable of controlling a wide variety of topologies, ranging from buck converters to forward, push-pull, flyback and trombone.

The PFS7524H is designed to minimize consumer energy consumption and provide superior performance. Its maximum current output and integrated internal safety features make it an ideal choice for AC/DC power applications where power regulation is critical. Its robust design also allows for operation in harsh environments, making it suitable for use in applications where temperature and vibration are in play.

The PFS7524H operates on a pulse width modulation (PWM) technique when PFC switching is active. In this mode, the PFS7524H turns the power switch on and off at an optimal frequency, determined by an internally generated PWM signal. This signal is computed using feedback signals derived from the sense pins and the output voltage. When the output voltage is below the programmed threshold, the PFS7524H increases the power switch’s duty cycle, hence increasing the amount of power being output by the converter. The switch will then remain ON until the programmed threshold is exceeded.

The PFS7524H also features an innovative auto-restart feature. This feature allows the PFC stage to recover in a very short period of time after any fault has occurred, ensuring that the converter’s efficiency is maximized. When the PFC stage fails, the auto-restart will bypass the PFC stage, allowing the converter to continue to maintain the load. The auto-restart will then slowly switch the PFC back in, allowing for a smooth start-up.

In addition, the PFS7524H acquires a voltage feed-back signal from the auxiliary windings of a flyback converter. It then adjusts the power factor through the modulation of the primary current based on the voltage changes. This feature provides great flexibility and system stability when dealing with high efficiency, wide range input and output applications.

The PFS7524H also features a low start-up current which allows the chip to be powered on without any initial current. This makes it suitable for applications where high current is not available, such as in battery powered systems. Additionally, the PFS7524H has an advanced overload protection system which allows it to be shut down before it gets damaged in the event of an over current or over voltage situation.

In summary, the PFS7524H is an ideal choice for AC/DC power applications where power regulation is necessary. Its advanced features such as auto-restart, voltage and temperature protection, and its low start-up current make it a dependable system controller for a variety of applications. Its versatile design also makes it suitable for a wide range of input and output applications, making it an ideal choice for any power-conditioning project.

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