LNK363GN-TL Integrated Circuits (ICs)

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As one of the offline switcher integrated circuits (ICs) in power management integrated circuits (PMICs), the LNK363GN-TL is a cost-effective solution for offline AC-DC power converters, particularly suited for cost-sensitive applications. In this article, we will explore the application field of the circuit and the working principle behind how the LNK363GN-TL functions.

The LNK363GN-TL is designed to be integrated into flyback, forward and quasi-resonant offline converters, suitable for power supplies with 12VDC to 24VDC inputs and up to 5A of output current. The integrated transistor allows for an exceptionally small footprint with up to 91.7% efficiency when used with a quasi-resonant converter. It also provides constant current and temperature control, safety control, and soft start without an external resistor.

The circuit is protected from any rapid changes in input or output voltages, removing the need for external surge current limiting. It also includes an integrated programmable frequency constant for whichever topology is being utilized, with a frequency range of 40kHz to 500kHz. The integrated optocoupler provides a guaranteed minimum response time to fault conditions such as output overvoltage, short circuit, and open loop, allowing for faster and better power supply protection.

The working principle of the LNK363GN-TL can be broken down into two parts: the oscillator section and the power amplifier section. The oscillator section works as the main control device for the switching frequency and includes an adjustable frequency control for each topology. It is also responsible for fault protection conditions, such as output over-voltage, open loop, and short circuit. The power amplifier section is responsible for pulse-by-pulse over current and voltage protection.

In the power amplifier section, the feedback circuit compares the output voltage to the reference voltage. When the output voltage is lower than the reference voltage, the current directly flows to the base of the power switching transistor. This makes the power switch transistor produce an on-state voltage drop, thereby allowing current to flow. When the switch transistor is on, it increases the upper output voltage to a level above the reference voltage. This turns off the power switch transistor, resulting in a decrease in the upper output voltage.

With the repeated on and off operation of the switch transistor, the circuit is capable of regulating the output voltage of the power supply. This is the principle by which the LNK363GN-TL functions. The circuit also includes auto-recovery protection and thermal shutdown, enabling the power supply to work at maximum efficiency for longer periods of time.

In conclusion, the LNK363GN-TL is a highly integrated offline switcher IC in power management ICs. It is designed for applications with 12VDC to 24VDC inputs and up to 5A of output current. The included integrated transistor allows for a very small footprint and 91.7% efficiency when utilized with a quasi-resonant converter. The working principle of the circuit consists of two sections: the oscillator and the power amplifier. With its extremely high efficiency, auto-recovery protection, and thermal shutdown, the LNK363GN-TL is an optimal solution for cost-sensitive offline AC-DC power converters.

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