This simple LED driver circuit can be used to drive many types of high power LEDs of different watts.  The circuit is using LM317T voltage regulator. LM317T is a very famous and versatile voltage regulator IC, available in TO 220 transistor package. The great feature of this IC is that it can also be used

as a current regulator. The output current of the IC is upto 1.5A, therefore you can drive any LED in this current range. Only you have to change the resistor Rx according to your LED current requirements and the LED driver will be ready to use.




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LM317 OUTPUT CURRENT CHART
MILLIAMPERE
Rx
25mA
50 Ohms
50mA
25 Ohms
100mA
12.5 Ohms
200mA
6.3 Ohms
300mA
4.2 Ohms
350mA
3.6 Ohms
400mA
3.1 Ohms
450mA
2.8 Ohms
500mA
2.5 Ohms
550mA
2.3 Ohms
600mA
2.1 Ohms
650mA
1.9 Ohms
700mA
1.8 Ohms
750mA
1.7 Ohms
800mA
1.6 Ohms
850mA
1.5 Ohms
900mA
1.4 Ohms
1000mA
1.3 Ohms
LED Driver Circuit
For getting the desired output current you can use the following table.