aprox. 100W
OK, and what is the temperature raise above ambient for 100W dissipation for the package and the heatsink you use? You have to take into account the
heat resistances involved and also the
power derating.
The power calculation should look like Rtot = Rjc + Rch + Rha where
Rjc: heat resistance from junction to case (stated in the datasheet)
Rch: heat resistance from case to heatsink (about 0.2 if you use the plain white heat paste)
Rha: heat resistance from heatsink to ambient (stated in the heatsink's datasheet)
If you do the math you will get something like 300C temperature raise above ambient. (that is with a really good heatsink).
I think someone has to do a video about power calculations and explain these figures. Until then, google is your friend