LNK418LG

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The LNK418LG is a high performance fully integrated, device designed to drive an array of white or RGB LEDs. With up to four current outputs each independently adjustable, the device can produce a wide variety of colors for backlighting by allowing for individually dimming three separate colours, or a balanced white backlight. The LNK418LG allows the user to adjust the output current levels to the LED array and provides constant current regulation while switching at a programmable frequency, up to 500kHz.

The application field of the LNK418LG mainly focuses on LED lighting applications such as LCD backlight, LED signage, automotive and any other application that requires multiple colors/ intensities of LED light. It can be used to create a balanced white backlight, control single color LEDs, or drive RGB LEDs. The device is designed to be fully load-independent and operate over a wide input voltage range of 5V to 45V.

The working principle of the LNK418LG is based upon its two major components, the Constant Current Output (CCO) and the PWM Dimming Circuit. When power is applied, the CCO charges up the output capacitors to the programmed current levels. Then the signals from the PWM Dimming Circuit modulate the current levels for each output according to the duty cycle of the signal. The duty cycles can be adjusted to achieve individual levels of intensity for different colors, creating the desired illumination effect.

The control signals for the PWM Dimming Circuit come from an external controller. This controller can be programmed to provide the desired level for each output, as well as the on/off switching frequency. The LNK418LG incorporates various built-in protection mechanisms such as over-voltage protection and over-temperature protection to ensure reliable operation even in demanding environments.

The LNK418LG offers many advantages over traditional LED drivers and systems. Its wide input voltage range and adjustable output current, combined with its flexibility in controlling multiple colors make it suitable for a variety of applications. The device also allows for higher switching frequencies, which can result in improved system efficiency and superior power factor.

In summary, the LNK418LG is a versatile LED driver designed for LED lighting applications. Its wide input voltage range and adjustable current levels make it ideal for controlling white or RGB LED arrays, while its built-in protection mechanisms ensure reliable operation. The device can operate at frequencies up to 500kHz, allowing for improved system efficiency and superior power factor.

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