LNK456DG-TL

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PMIC - LED Drivers include a wide range of controllers that are used to provide consistent light and current to LED lights. LNK456DG-TL is an example of such a controller. This application note outlines its field of application and working principle.

Application Field

LNK456DG-TL is a LED driver with dimming and average current control. It widely applies to LED applications such as LED backlit LCD and LED signboards. Primarily, it is used in applications where current control below 0.5A and voltage below 12V is required.

The controller offers programmable brightness control and extended dimming range. Depending upon the dimmer interface the dimming can be done at 0.1% steps. Moreover, it has spread-spectrum capability for EMI reduction, over-voltage protection and a selectable line frequency.

Working Principle

The LNK456DG-TL works with minimum external components. The design of this driver is based on current mode control, which entails that the driver adjusts the voltage automatically to maintain the current set at the source side. This design allows the driver to create both accurate and consistent light output.

The drivers use a Synchronous Buck topology, which makes them highly efficient. Its patented valley-turn-on technology reduces switching losses and electromagnetic interference. In addition, this allows the driver to handle a wider input voltage range and reach a higher efficiency.

The LED driver also features a unique “power limit” feature. This option helps to avoid large inrush current during startup and provides a better ripple solutions. Furthermore, an accurate end-of-charge detection helps to prolong the life span of LED lights.

Conclusion

The LNK456DG-TL is a robust LED driver with dimming and average current control capabilities. It is used in applications where current control below 0.5A and voltage below 12V is required. Its Synchronous Buck topology ensures high efficiency and low losses while its specific “power limit” feature allows it to avoid inrush current during startup. Additionally, it features a patented valley-turn-on technology that helps to reduce losses and reduces EMI. All these features make this LED driver an ideal choice for LED applications.

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