I'd like to connect a D2pak device to a heatsink underneath a PCB. How can I optimize heat transfer, and how do I calculate the thermal resistance of the board?
I know lead is a poor heat conductor compared to copper...... but should I insert 10 smaller vias vs. 1 large via? These would be plated through holes obviously, and probably filled with solder to help conduct heat.
Ultimately I just need to know if I have 10 watts in, and a 5 degree C/W heat sink on the other side, how hot is the whole dang thing going to get?