I have two questions, one is how to calculate the heat dissipation from M1 and M2, and the second is how to calculate the maximum frequency M2 can handle. The LED is a Cree XLamp XQ-D running at 3.1V and 350mA. There is a 3.1 volt drop across the LED leaving 1.9V across M1, M2, and R2. I did find the heat information on the data sheets, I just don't know how to use them. My guess is 1.9 volts times 350mA times 65 degrees C/W giving 43.225 watts. I don't know if this is right. I've attached a picture of the circuit and the data sheets for M1/M2 and the LED.(adsbygoogle = window.adsbygoogle || []).push({});

Thanks a lot,

Mike

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# Heat Dissipation and Max Frequency Question

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