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LED Driver Using the LM317

Here is another electronic circuit of a driver for Led, this project is identical to the previously published, to Current Regulator for LED High Brightness 1 Watt tipo estrela ( Led Driver). He is part of a series of publications on Led Driver.

This driver uses the famous voltage regulator LM317, which in this case is configured as a current regulator or Current limiter. This circuit can be easily constructed, low cost and ideal for those with no knowledge of electronics or getting in Hobby.

Driver para LED Usando o LM317

In the LM317 regulator driver is used as a voltage source 1.25V, where the pin is output with 1.25 Volts relative to the adjustment. The calculation for this drive is simple resistor, V is the voltage regulator output, R is the resistor limiter and Iout is the output current.


Knowing the voltage (In) as we speak is already 1.25 Volts and the current that the LED 1 Watts needs is about 330 mA (+OR-) , the calculation is simple resistor, 1.25 x 330 = R . The result is 4.12 Ohms, rounding the resistor may be one of 4R2 1 Watts. Since this resistor is not standard commercial, We can do this as follows, associating in parallel 3 resistors 12 Ohms por 1/2 Watt.

A resistor 3.9 ohm por 1 Watt will also work perfectly. Do not forget to put the necessary Led and the regulator on a heat sink to prevent overheating, Led does not support high temperatures, the regulator has already a shield and its power decreases with increasing temperature. Soon I will be publishing more for LED driver circuits with different power ratings.

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