hannobisschoff@gmail.com
Member
You work backwards from the maximum ambient temperature and forward from the power dissipated. From that you can determine the maximum thermal resistance you can tolerate for the heat sink which will dictate the size of the heat sink.
POWER DISSIPATED=18WATTS
max ambient temp=40'C (just in case)
What now.
I know you must be pulling the hair out of your head in frustration, but please bear with this newbie.