![]() ![]() soĪs you can see in the LED driver circuit diagram, for a resistor value of 5.5 ohms the current drawn by the LED is limited to 0.23A. ![]() ![]() I = Vref/R1 where, Vref is 1.25V for LM317. This current rating is fixed by the Resistor R1 in the circuit. The above circuit is designed to drive a LED with 0.2A. The circuit Diagram of the high power LED driver is shown in the image below.Īs you can see the driver has nothing more than a LM317 IC and a resistor. In this article I will explain you how you can design the circuit based on your current limitations using the LM317 IC as a current limiter. The amount of current that an LED can consume will be mentioned in the datasheet of that LED. ![]() Hence we use a driver circuit which restricts the flow of current that passes through an LED. An LED can also be powered directly form a suitable power source but in most cases the LED will pump in more current than it could handle and it eventually get destroyed. These tiny little things illuminates a lot of area that we expect it to be, in this tutorial we will learn how easy it is to use one and how can we design our own circuit to drive such LEDs based in their operating current.īefore we get much deeper into this project, it is important to understand why one should use a LED Driver circuit to power an LED. High Power LED lights have lots of applications starting from Emergency lights to Head Lights in some expensive cars. ![]()
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