LNK414LG

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PMIC - LED Drivers are devices that can control, monitor and deliver a current to light emitting diodes (LEDs). The LNK414LG application field includes interior, ambient and color lighting in automotive, architectural, consumer electronics, home appliance and signage applications.

Working Principle

The LNK414LG is an off-line boost converter with an integrated MOSFET. It includes an adaptive OFF-time control and a current limit with frequency dithering. It has a wide output voltage range of 3V to 55V, making it suitable for driving high-power LEDs.

The ON-time gain of the LNK414LG is adjustable. The lower the ON-time gain, the higher the current limit. When a higher current is desired, the driver must have an accurately calibrated current limit. The LNK414LG senses the applied voltage to the inductor and employs a voltage loop to accurately regulate the output voltage.

The LNK414LG utilizes an adaptive OFF-time control that allows for a wide range of LED forward currents. The OFF-time is adjusted using an external timing resistor. When a higher LED forward current is desired, the timing resistor can be replaced with a lower-value resistor.

In applications where the LED current is to be limited, the LNK414LG can be used with an external current-sense resistor. The resistor should be connected in series with the LED and the ground. When the LED forward current exceeds the specified current limit, the LNK414LG will reduce the power supplied to the LED to the current limit.

The LNK416LG also features frequency dithering. This is a feature that causes the frequency of the switching of the MOSFET to be periodically modulated. This reduces the amount of radiated electromagnetic interference. The frequency modulation also results in tighter output voltage control, which results in improved LED brightness.

Conclusion

The LNK414LG is an ideal driver for automotive, architectural, consumer electronics, home appliance, and signage applications. It is a highly integrated device that is easy to use and configure, making it a cost-effective solution for LED lighting applications. The LNK414LG is able to accurately and reliably control the LED forward current and brightness, making it a reliable and robust LED driver.

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