FAN9673QX Integrated Circuits (ICs)

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Power Factor Correction (PFC) is a key component of the power management system. It is used to improve the power efficiency and quality of power delivered to electronic devices. The most common type of PFC is Peak Load Shifting (PPS). PPS techniques are used in many high-end power system designs. This article focuses on the application field and working principle of FAN9673QX, which is an integrated power factor correction (PFC) and quasi-resonant topology control IC.

FAN9673QX is a single-stage, quasi-resonant PFC converter IC. It is optimized to maximize the dynamic range of PFC regulators while achieving high efficiency and good EMI performance. It is well-suited for providing power to switch mode power supplies (SMPSs), such as adaptor, LED drivers and other power applications. The FAN9673QX IC is equipped with a wide input voltage rating range of up to 30V. It features advanced self-protection circuits such as overvoltage, overtemperature and short-circuit protections.

The main purpose of FAN9673QX is to regulate the power delivered from the power supply or mains to the load. This regulation is performed through the integrated PFC control loop. The PWMDACV pin of the IC is used to adjust the power stage output voltage, while the PFCPGA pin is used to regulate the duty cycle of the controller based on the output voltage. The two PFC inputs - PFCCMP and PFCOT - detect the current and temperature of the power stage, respectively, providing feedback for the PFC loop. Thanks to its low ripple input current and fast response time, FAN9673QX PFC controllers can achieve high power factor and low harmonic distortion.

In addition to the PFC loop, FAN9673QX also includes a low-side power switch driver. The device can drive power switches with a maximum 100A current limit. The driver has built-in active latch-off function for over-current protection. The built-in resonant circuit generates high-frequency oscillations, which helps to reduce EMI emissions.

In conclusion, FAN9673QX is an integrated PFC and quasi-resonant controller IC. It is optimized to provide high power factor, low EMI and excellent power efficiency. The device provides robust protection features, such as overvoltage, overtemperature and short-circuit protection, making it an ideal solution for switch mode power supplies. With its wide input voltage, fast response time and high current capability, FAN9673QX PFC controllers can be used in a wide variety of applications.

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