555 constant current led driver

 · An LED driver is an electronic circuit used to power an LED (light-emitting diode). LED drivers are widely used for driving high voltage LEDs or lamps or miniature LEDs for indication via microcontroller signals. An LED driver circuit must provide enough current to light up the LED but must limit the current to prevent damage. A constant current regulator is Author: Darshil Patel. if you're powering a string of 5 LED's, perhaps not such a big deal. - no change in current set-point when temperature changes - less current capacity (5 amps - still enough for a lot of LED's) how to use it: resistor R3 sets the current. the formula is: LED current in amps = / R3 so for a current of mA, set R3 to ohms you'll need a power resistor usually, R3 power in . As the name suggests, the constant current driver will supply the same current whatever voltage it is supplied with and whatever the forward voltage of the LED. You just set the current and that is how much current will flow through the high-power LED. A very useful IC that is often used for this purpose is the LM This IC is primarily intended as an adjustable voltage .

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