The Proper Heatsink

Discussion in 'General Electronics Chat' started by Dalaran, Jul 7, 2010.

  1. Dalaran

    Thread Starter Active Member

    Dec 3, 2009
    168
    0
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
  3. Norfindel

    Active Member

    Mar 6, 2008
    235
    9
    To calculate the heatsink, you need to know the maximum power dissipation, calculated as bertus told you, the maximum junction temperature (from datasheet, in this case 125°C), the thermal resistance of the device (from datasheet, in this case it seems to be 2.7°C/W), and the maximum ambient temperature you want it to be able to handle (for example: 40°C, if you want it to work on a hot summer at normal ambient temperatures. It could be even more if the place where it's put is hotter).
    If you use some thermal interface matherial, you also need to know it's thermal resistance.

    The datasheet explains the thermal calculations, under "Thermal considerations" in page 8.
     
    Last edited: Jul 8, 2010
Loading...