Maximum power dissipation

Hello,

I used 50 degrees C for the ambient temperature because that is the maximum temperature that I can observe inside a box that has been running for a few hours. Remember I am rating this thing for still air.

However, even if I use 30 degrees C, I still get (80-30)/20 = 2.5W which is still below the 3-4W that you estimate.

Please help me understand what numbers you used in your calculations, then I could get a better idea about how to estimate the maximum power dissipation for these devices.

Dave Rector

*:^)