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LTSPICE-Slide12

The graph shown here provides an insight into how the NTC Thermistor model handles the self-heating aspect. Managing or limiting the self-heating effect is very important in circuits where NTCs are being used as temperature sensors. When too high of current is applied to an NTC thermistor, the self-heating affect can cause significant inaccuracies in the simulation if not taken into account. In this case, the current has been excessively multiplied by a factor of 10 (2mA instead of 0.2mA). The result can clearly be seen in the simulation as the NTC voltage drops earlier as compared to the normal situation.

PTM Published on: 2016-06-28