david90
Advanced Member level 1
say u have an LED that has a max current of 20mA and u would like to drive it with a PWM to save energy. how do you determine the pulse width of the output that would give u 20mA so that u don't burn out the LED?
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if ur Imax=20mA, and u want to achieve Iout=Imax=20mA, though PWM method, then u will always get 100% duty cycle. and no PWM is achieved.david90 said:say u have an LED that has a max current of 20mA and u would like to drive it with a PWM to save energy. how do you determine the pulse width of the output that would give u 20mA so that u don't burn out the LED?