LNK6764K

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Power Management Integrated Circuit (PMIC) is an integrated circuit (IC) that includes a complete power management system, in which the raw power is managed. This power management system consists of multiple components, such as AC-DC converters, offline switch converters, voltage regulators, and other components. The PMIC ICs are designed to achieve the complete power management system, and LNK6764K is one such example of such ICs. It is a BOM-friendly offline switcher with active PFC and is suitable for universal input AC applications, such as universal adapters and home appliances. This IC provides an integrated solution for universal AC input, active power factor correction (PFC), post-regulator, and current-compensation control to meet the demanding requirement of energy-efficiency regulations.

The working principle of the LNK6764K offline switcher involves the rectification of mains AC to DC in the active Power Factor Correction (PFC) stage. Then, the high voltage DC is used to charge an energy storage capacitor, which is connected to the output converter circuit. The output converter regulates the output voltage of the system by controlling the conduction of the output switching devices at the desired frequency. The power switch is controlled by the CMOS control IC, which is integrated in the LNK6764K IC. The CMOS control IC senses the input voltage, output voltage, and flow of current in the system and controls the power switch accordingly. This regulation technology helps to lower the total system cost and improve the overall efficiency.

Besides active PFC, other features of LNK6764K also make it suitable for universal input AC application. It has a low startup current, whose current is adjustable up to 500mA or 600mA, depending on the model, making it suitable for systems with different current needs. It is equipped with a powerful loop controller to ensure better performance, higher accuracy, and improved EMI performance at maximum output power. It also supports various protections, like cycle-by-cycle current limit and over-voltage protections, to ensure safe and reliable operations. In addition, the LNK6764K can be optimized with external components to further reduce energy losses or boost the power efficiency.

In conclusion, LNK6764K is a power-efficient and BOM-friendly PMIC IC for AC input application. It integrates active PFC and output converters with a powerful loop controller and high-efficiency protection features. The integration of active PFC and output converters makes it suitable for universal input AC applications, such as universal adapters and home appliances. The various protection features ensure safe and reliable operations, while the external components can be used to further reduce energy losses or boost the power efficiency.

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