I have a very small board that I would like to model for thermal analysis. I am pretty confident that I can get by with a first order analysis since I only want to know if I have a prayer of a chance of dissipating the heat from this board, rather than a detailed analysis of the range of temperatures across the board. I was thinking about drawing a simple spice circuit with current to represent heat, resistors to represent thermal resistance and voltage to represent temperature.
Sounds pretty simple, right? But even after doing some web searching, I have no idea where to find details on the thermal conductivity of PCB material and the values to use for transmitting heat from the board to the air. I am surprised that this is not commonly used, but it appears that most IC data just *assumes* that your board is large enough that it is a good heatsink. I did not find a single reference with info on the PCB.
Am I not looking hard enough? Can anyone point me to the raw data on PCB thermal characteristics I need for this analysis?