Six Steps to Design Your Own Heat Sink
1. Determine the maximum allowed thermal resistance (θmax
2. Determine the maximum space (width, length, height) available for the heat sink, and the airflow speed in your system (0 if there is only natural convection);
3. Calculate the thermal resistance (θSA
) a heat sink can achieve within that size;
4. If θSA
, you need to either increase the heat sink size or the airflow speed, or change the power and temperature parameters so that θmax
is higher. You may also try to use a more conductive mateiral such as pure aluminum and copper.
5. If θSA
, congratulations, you got a solution. But you may want to make it smaller. You can repeat steps 3-5 to find a smaller size that still satisfies θSA
, but make sure you build in some margins to improve the robustness of your design;
6. Optimize the heat sink, add a thermal interface material, add mounting hardware, and you are done! You may also want a heat sink manufacturer (such as MyHeatSinks) to review it.