LNK520G-TL

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IntroductionPMIC (Power Management Integrated Circuit) is a single-chip integrated power management circuit, responsible for the design and control of the entire power supply circuit, which can accurately and rapidly respond to different operating conditions and provide multiple power conversion functions. AC/DC converters and offline switches are one of the most important components. The LNK520G-TL is a powerful offline, high voltage switcher, providing many versatile and comprehensive protections and other related features.ApplicationsThe LNK520G-TL is applicable as a quasi-resonant flyback power supply (QRFP) converter. It has excellent electromechanical properties, such as overvoltage, overcurrent and short circuit protection. This makes it suitable for use in power conversions in applications such as lighting and communications. Moreover, it can be used as a constant voltage/constant current source with adjustable output voltage and current, enabling power delivery over long distances with low loss.Working PrincipleThe LNK520G-TL features a dual-mode control mode, including DC-to-DC direct feedback, constant on-time (COT), and valley- and peak-mode control (V/PM). The device utilizes a Constant Voltage/Constant current (CVC/CVC) control scheme when operating in direct feedback. This scheme provides accurate, stable output voltage and current with minimal output voltage ripple, making it ideal for powering linear ICs and other sensitive components.The CVC/CVC control scheme utilizes the LNK520G-TL\'s integrated PWM comparator, which senses the di/dt of the output voltage and controls the ON/OFF switching of the power devices accordingly. The device also features a slew-rate control that allows the converter to transition smoothly between different operating modes.ConclusionThe LNK520G-TL is an ideal offline switcher for applications requiring high efficiency, stable output voltage and current, as well as robust protection features. Its combination of constant voltage/constant current control, COT, and V/PM control gives the device superior control accuracy and flexibility when operating in different conditions. This makes it suitable for power conversions in lighting, communications, and other high-reliability applications.

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