ON Semiconductor FAN9673QX - Critical Conduction Mode PFC Controller

The FAN9673QX from ON Semiconductor is a sophisticated Power Factor Correction (PFC) controller specifically designed for use in power supplies that require high efficiency and reliability. This critical conduction mode (CrM) PFC controller is ideal for applications such as AC-DC adapters, power supplies for LCD TVs, and power supplies for desktop computers, where energy efficiency is of paramount importance.

The FAN9673QX integrates features that enable the design of a power supply with a very low total harmonic distortion (THD) and a high power factor (PF), meeting the stringent requirements of international energy-saving standards. Its multi-system compatibility allows for flexibility in designing power supplies that adhere to various global power regulations.

Key features of the FAN9673QX include its ability to operate under CrM, which minimizes switching losses by turning on the MOSFET at zero current. This feature, combined with its zero-voltage switching (ZVS) capability, enhances the overall efficiency of the power supply. The controller also supports brownout protection and offers various protection features such as over-voltage, over-current, and under-voltage lockout, ensuring safe operation under abnormal conditions.

The device is equipped with an internal startup timer and a soft-start feature to limit inrush current during startup. Its frequency modulation helps to reduce EMI emission, and a built-in total harmonic distortion (THD) optimization circuit ensures compliance with global energy efficiency standards.

ON Semiconductor's FAN9673QX comes in a compact PQFN package, which is optimized for thermal performance and space-saving on the PCB. The combination of advanced features and compact design makes the FAN9673QX an excellent choice for engineers looking to create power supplies that not only meet but exceed energy efficiency benchmarks.

Overall, the FAN9673QX PFC controller by ON Semiconductor represents a state-of-the-art solution for power supply designers aiming to achieve high efficiency, reliability, and compliance with global energy standards.