LM3519MKX-20/NOPB

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LM3519MKX-20/NOPB applications and Working Principle

The LM3519MKX-20/NOPB is a constant current LED driver IC (Integrated Circuit) that has been designed for use in the PMIC - LED Drivers market segment. It offers one of the highest power efficiency and reliability in the industry, and is designed to deliver consistently stunning lighting effects across whole range of LED lighting applications.

In PMIC-LED Drivers, the LM3519MKX-20/NOPB offers a wide range of features that make it an ideal choice for a variety of applications. These include its excellent thermal performance, low external component count, low operating voltage range of 3.0V-5.5V, soft start and over-temperature protection that have made it a popular choice for manufacturers.

The LM3519MKX-20/NOPB is also very versatile in its range of possible applications, making it suitable for a broad range of lighting products including automotive, commercial and residential lighting products. It includes features such as Soft Start, Over-temperature protection, Open-circuit protection and Thermal Shutdown.

The key feature of the LM3519MKX-20/NOPB is its ability to regulate the LED current in a specified range. It does this with its an adjustable maximum current (I_MAX) through an external resistor connected between the CRS and CCA pins. The LM3519MKX-20/NOPB also offers valuable features such as soft start and over-temperature protection making it an ideal choice for automotive and commercial lighting applications.

The working principle of the LM3519MKX-20/NOPB is relatively straightforward. It uses the output of the current sense resistor (CS) to regulate the output current over a wide range of different currents and temperatures.

The CS resistor connects across CRS and CCA pins. The value of the CS resistor determines the output current capability. The output current is then monitored by Comparator A whose output is compared with a scaled current voltage derived from the CS resistor and an external Reference Voltage (VREF). When the output current reaches the programmed value, Comparator A turns off the transistor of the output stage.

The LM3519MKX-20/NOPB also has an adjustable soft start which reduces the in-rush current during startup. This is done by increasing the output voltage slowly over a programmed time to reduce the current surge. This feature helps in minimizing output di/dt which can damage the LEDs.

The LM3519MKX-20/NOPB also includes an over-temperature protection feature which reduces the output current when the chip temperature reaches exceeded levels. This helps in protecting the LEDs from burns when operating temperature rises.

Overall, the LM3519MKX-20/NOPB is an ideal choice for LED drivers application in PMIC - LED Driver market segment due to its excellent thermal performance, low external component count, low operating voltage range, soft start and over-temperature protection features. It is also highly versatile and can be used in a range of LED lighting products including automotive, commercial and residential lighting products.

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