Input/Output Indicator LED Lights

[tomchr]

I've run "20mA" LEDs in multiplexed displays with >50mA but 1/8th of the time. The efficiency does fall-off, but not much.

So the RMS current level was ~6mA? Is this not PWM as I suggested?

It is PWM, but the RMS current is 17.7 mA rather than ~6 mA. For a square wave, the RMS is sqrt(D)*Amplitude.

Tom

 

[PRR]

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