LNK605PG

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PMIC - AC DC Converters, Offline Switchers

The LNK605PG is a monolithic power IC that combines a high-voltage MOSFET switching with a high-voltage controller, enabling power conversion/regulation from mains AC input to a stabilized DC output. The unique characteristics of this device make it suitable for a wide range of applications. This article will cover the application fields and working principle of the LNK605PG.

Application Fields

TheLNK605PG is used mainly in offline AC/DC converters for a variety of applications including computers, consumer electronics and power adaptors. This IC is capable of driving loads up to 600W, depending on the application. It features primary side control, allowing for reduced BOM costs and increasing power conversion efficiencies. It also supports universal input range from 85VAC to 264VAC and achieves high conversion efficiencies up to 90%.

In addition, the LNK605PG is also suitable for LED lighting applications. It comes with an integrated dimming control, allowing the LED light intensity to be adjusted according to the ambient light intensity. It also supports various dimming protocols like 0-10V, 1-10V, phase cut, PWM and more. It is capable of driving high power LED arrays over a wide input voltage range of 170V to 265V with efficiency up to 98%.

Working Principle

The working principle of the LNK605PG is a combination of a high voltage MOSFET switching with a high voltage controller. The high voltage MOSFET switching is a Power Factor Correction (PFC) stage, which ensures an optimal power factor at the AC Input. Following this, an AC/DC conversion takes place to provide a stabilized DC output voltage. This is accomplished with a flyback topology, where a control loop circuit activates a high voltage switching MOSFET, that provides a regulated output voltage and controls the output power.

The high voltage controller keeps the MOSFET switch operating optimally. The controller senses the current flowing through the inductor and controls the switching of the MOSFET so that it maintains the output voltage. It also supports various protection schemes to protect against overload, output short-circuit, open-circuit, over-voltage and over-temperature situations.

In addition, the LNK605PG also supports dimming control for LED lighting applications. The on-board dimming circuit automatically adjusts the LED intensity according to ambient light intensity. The dimming control supports 0-10V, 1-10V, phase cut, PWM and more dimming protocols.

Conclusion

In conclusion, the LNK605PG is a monolithic power IC suitable for a wide range of offline AC/DC conversion applications, including computer power supplies, consumer electronics, and LED lighting drivers. Its integrated design includes a high voltage MOSFET switching stage and a high voltage controller, giving it the ability to provide regulation over a wide input voltage range while maintaining high power conversion efficiencies. In addition, it supports various dimming control protocols, allowing the LED light intensity to be adjusted according to the ambient light intensity.

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