LNK6766V

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The LNK6766 is a high-performance all-in-one offline switcher IC with high integration, fast response, and low EMI noise. As a power management device, it is widely used in AC/DC converter applications and off-line switcher applications, allowing designers to design cost-effective and reliable power conversion solutions. This paper will focus on the application field and working principle of LNK6766V, and explain its advantages.

Application Field

The LNK6766V is a universal offline AC/DC converter, providing efficient and reliable power conversion for many industrial, commercial and consumer electronic applications. It is suitable for commercial, industrial and home applications, such as LED lighting, power supply, motor control and other AC/DC conversion. The main features of LNK6766V include high peak current range, good EMI performance, low transient output voltage, and over-temperature and line-current protections.

Working Principle

LNK6766V adopts a two-stage power conversion structure, consisting of a PFC converter and a half-bridge LLC resonant converter. First, in the PFC stage, a single-ended forward converter is employed to achieve a high power factor. The output of the PFC converter is then connected to the input of the LLC resonant converter. The output of the converter is then regulated to provide a stable DC output voltage.

The PFC converter consists of a power switch and an input filter, and its working principle is to convert the rectified input AC voltage into a DC bus voltage, and then use the switch to regulate the DC bus voltage to reduce the THD (total harmonic distortion) of the AC input current. At the same time, the input filter is used to suppress the switching noise generated by the PFC converter.

The LLC resonant converter is composed of a half-bridge switching circuit and a resonant circuit. The half-bridge switching circuit is responsible for modulating the impedance of the resonant circuit, thus realizing the power conversion. The LLC resonant switching frequency is independently controlled by the control circuit to ensure an efficient and stable operation.

The LNK6766V\'s PFC/LLC two-stage conversion structure has excellent EMI performance and fast transient response, which can greatly reduce the amount of components used in the circuit, reduce the volume and weight of the power supply, and reduce the overall cost. Furthermore, the PFC/LLC two-stage conversion structure can automatically sense and select the right input voltage range, and can provide rapid load step response.

Conclusion

The LNK6766V is an all-in-one offline switcher IC with high integration, fast response, and low EMI noise. Its application field covers a wide range, including commercial, industrial, and home applications. It adopts the PFC/LLC two-stage structure to convert AC to DC, and its excellent EMI performance and fast transient response can help the circuit reduce the number of components, reduce the volume and weight of the power supply, and reduce the overall cost.

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