ok, here's my questions... and it's coming from looking at alot of these switch mode power supply converters, where the voltage out is some relationship with the voltage input and the duty cycle.
well... if you have a waveform that is high for 50% of the period, you have a .5 duty cycle, then on average you have 50% of your peak... if the relationship is Vin*D = Vo, and Vin is 10V, then you have 5volts out...
Then you have the RMS value of this same waveform, and it's value is Vin * sqrt(D) = 7.07V
well.... what's the significance of this?
If the above waveform was current, and Iin was 10A... and I needed to spec a part, I'd look for the RMS current rating right? and make sure it was above 7.07A... I wouldn't look at the average current rating
5A....But then why don't we call Vo = 7.07V and call it a day? why can't we just use either RMS or average when dealing with these pulsed waveforms?
much thanks!