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LED-Overview-Slide8

A better way to drive the LED is with a constant current source. This circuit will provide the same current from device-to-device and over temperature shifts. It also has lower power dissipation than using a simple current limiting resistor. Commercial, off-the-shelf LED drivers are available from a number of different sources. Typically these operate using pulse width modulation (PWM) principles for brightness control. 

PTM Published on: 2011-11-03