LC5546LD

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PMIC - LED Drivers

• LC5546LD Application Field and Working Principle

  The LC5546LD is a type of LED driver developed and released by Texas Instruments, specifically for driving high-power LED applications. The LC5546LD supports various LED configurations such as high-power single, discrete, two-string, extended-string, and multi-string LED applications. It integrates a buck and a boost functionality, and provides a high efficiency solution with a wide input voltage range and output current range.

  The LC5546LD is designed to drive high-power LEDs, such as those found in automotive exterior lighting and headlamps. Its buck-boost based design, along with the various LED configurations and wide input and output ranges, allow incredible flexibility when driving high-power LEDs. Additionally, the LC5546LD offers several features that protect against faults and ensure operation of the LEDs even under extreme conditions. These features include, but are not limited to, short circuit protection, over temperature protection, current limit protection, open cluster protection, and over voltage protection.

  The working principle behind the LC5546LD is relatively straightforward. The device combines both a buck and a boost stage, and is controlled by an integrated pulse-width modulation controller. To start, an input voltage is supplied to the LC5546LD and is regulated to an output voltage which is determined by the duty cycle of the buck stage. The buck stage then regulates the output voltage to the desired value, while the boost stage acts as a current source to provide current to the LEDs. The output current is determined by the voltage at the current-sensing pin, which is proportional to the sum of the boost and the buck stages. The buck and boost stages work together to provide a highly efficient and reliable LED driver solution.

  In conclusion, the LC5546LD LED driver is a great solution for driving high-power LEDs in various configuration. Its buck-boost design and wide input voltage and output current ranges provide excellent flexibility and power efficiency. Additionally, the integrated fault protection features ensure operation even under extreme conditions. As a result, the LC5546LD is a perfect choice for automotive exterior lighting and headlamps.

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