133 Pages

## Course Edit

This page is for the course ELEC3106 - Electronics and is based on the lectures of Torsten Lehman

## Prerequisites Edit

A basic understanding of circuit theory and heat flow is assumed throught this page. These topics are covered in ELEC1111, ELEC2134 and PHYS1231

## Thermal Management Edit

### Electrical Model of Heat Transfer Edit

A simple application of an analogue to Ohm's law can be employed on a heat sink attached to a transistor. This is given by

$T_j=P_D\cdot R_{\theta}+T_A$

where $T_j$ is the maximum transistor junction temperature in units of degrees Celsius; $P_D$ is the power dissipated in units of watts; $R_{\theta}$ is the thermal resistance of the heat sink in units of degrees Celsius per watt; and $T_A$ is the ambient temperature in units of degrees Celsius.