Selecting a Heat Sink (Without an Air-Cooling Fan)
Author: kuni3075Executions: 14606
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Calculate the thermal resistance required of a heat sink when cooling ICs and other components by mounting a heat sink on them.
Rf = ((Tj - Ta) / Q) - Rc - Rcf
・Tj → Junction temperature [°C] (or target temperature inside the IC)
・Ta → Ambient temperature [°C]
・Q → Heat dissipation of the IC [W]
・Rc → Thermal resistance of the IC package [°C/W]
・Rcf → Thermal resistance of thermal grease or similar material between the IC and the heat sink [°C/W]
*If you want to calculate based on the temperature of the IC surface as the target temperature, enter the target temperature as Tj and enter 0 for Rc.
・Tj → Junction temperature [°C] (or target temperature inside the IC)
・Ta → Ambient temperature [°C]
・Q → Heat dissipation of the IC [W]
・Rc → Thermal resistance of the IC package [°C/W]
・Rcf → Thermal resistance of thermal grease or similar material between the IC and the heat sink [°C/W]
*If you want to calculate based on the temperature of the IC surface as the target temperature, enter the target temperature as Tj and enter 0 for Rc.
| Rf | K/W |
Reference: https://www.infineon.com/dgdl/AN-1057J.pdf?fileId=5546d46256fb43b301574c5fa3b37c0b
*Default values are based on the example on page 12 of the reference.
*Default values are based on the example on page 12 of the reference.
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