
#1
Sep3008, 12:28 PM

P: 1

1. The problem statement, all variables and given/known data
I am given two waveforms (a square wave and DC) that define the maximum allowable operating parameters for an LED. I wish to derive the maximum allowable fullyrectified sine waveform (120hz). Square wave: 442mW peak, 0.1ms pulse width, 10% duty cycle DC: 87mW See attached PDF. Use the power on the right axis instead of current on the left. Also ignore the temperature stuff. I was trying to figure out why the energy for each waveform is different. Here is a link to the actual spec sheet: http://marktechopto.com/pdfs/Cree/LO...%2003DEC07.pdf This is a twopart question. First, how do I write the integral for the fullwave rectified sine? Note that the sinewave's xaxis intersection is advanced/delayed by ~1.12ms. Integrate from 0 to pi? Second, how do I deal with the fact that the total energy for the given waveforms is different? Or is this unsolvable? 2. Relevant equations 3. The attempt at a solution See PDF. 


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