Jun 30, 2020 · In this tutorial, we are going to make a simple LED driver circuit. This circuit is used to drive different kinds of high-power LEDs of different watts. This is a simple DIY project using an LM317T IC and a few passive components.

Jul 25, 2015 · I came across this simple LED Driver circuit ( I am aware of the power losses but just wanted to understand its working) . Now in a Voltage regulator configuration , ADJ is connected to a voltage divider which sets the voltage output at the OUT pin .

Constant-current LED Driver Using the LM317-N You could connect the output of this to a series of LEDs (with the other terminal connected to ground) to create a very simple LED driver architecture.

May 7, 2024 · Learn how to make an LM317 precision current regulator circuit. Example shown to drive LED using LM317 currrent limiter.

If you're wanting to use the LM317 you could simply replace one (or even both) of the adjustment resistors with a digital potentiometer. These are little chips that emulate a pot but are linked to an MCU through such things as SPI or I²C for the MCU to control the resistance.

The LM317 is very easy to use in a constant current mode. It will always strive to keep its output voltage at exactly 1.25V above whatever voltage the Adj (adjust) pin is at. The LED we are going to use is a 1W white light LED.

The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying up to 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%.

See LM317 Constant Current Source for Lighting LEDs. Fig. 2. LM317 driving three high-power white LEDs at 120mA. One can vary VIN from 15 to 35 volts and IOUT will stay a constant 120mA. Fig. 3. In Fig 3 the current has dropped below 120mA due to VIN of 12-volts - too two close to the output voltage for the load. In general VIN > Vload + 5V.

Jan 3, 2024 · In this post I have explained a simple LM317 IC based RGB 3 watt LED color mixer circuit, which can be used for demonstrating the color mixing effects of red, blue, green colors as specified in the standard color charts.

Jun 13, 2024 · High power constant current LED driver using LM317. This Instructable will show you how to build a Constant Current for high power LEDs, using only two components. High power LEDs are getting cheaper and cheaper, however the constant current drivers, to drive them are pretty expensive.