Thermal resistance calculator

Content

Introduction

Minimal amount of boundary information

Thermal interface material refinement

Junction information refinement

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The thermal resistance calculator is a free tool on ColdStream to calculate the thermal resistance of a default heat sink design. This tool finds its use in giving the user a clear indication of how some of the boundary conditions affect the thermal resistance of this standard heat sink.

The thermal resistance calculator tool has 3 refinement levels. The following chapters delve deeper into each of these refinement levels.

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The resistance to heat flow from the junction of the heat generating component, through the case and the heat sink to the environment will be automatically calculated using the following equation: \[R_{heat\space sink}=\frac{T_j - T_{amb}}{P}\]

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The resistance to heat flow from the junction of the heat generating component, through the case and the heat sink to the environment will be automatically calculated using the following equation: \[R_{heat\space sink}=\frac{T_j - T_{amb}}{P}-R_{interface}\]\[R_{interface}=\frac{t_{interface}}{L_s*W_s*\kappa_{interface}}\]

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The resistance to heat flow from the junction of the heat generating component, through the case and the heat sink to the environment will be automatically calculated using the following equation: \[R_{heat\space sink}=\frac{T_j - T_{amb}}{P}-R_{th-jc}\]