PWM LED dimming switches on and off at a high speed. The effective if the average is based on the SI time when the LED is on and when off. By using the method PWM LED dimming, on / off frequency must be faster than the human eye can detect to avoid visible flicker. PWM frequency of 200 Hz or higher usually avoid flicker problems. Many PWM current conductors have a specialized LED PWM dimming pin that supports a wide range of frequencies and amplitudes PWM, allowing a simple interface to the external control logic. Often these chips dimming LED driver offers several ways to mitigate an LED.
For example, the LED driver LM3409 from National Semiconductor provides several ways of IF modular LED through PWM techniques. Many vendors, including Allegro Microsystems, Analog Devices, Linear Technology and offer drivers LED PWN National Semiconductor.
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