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ThermalResistancecalculation
1)ThermalResistance
TheheatcausedbythepowerlossPtotintheactivesemiconductorregionduringoperationresultsinanincreasedtemperatureofthecomponent.Theheatisdissipatedfromitssource(junctionJorchannelCh)viathechip,thecaseandthesubstrate(pcboard)totheheatsink(ambientA).ThejunctiontemperatureTjatanambienttemperatureTaisdeterminedbythethermalresistanceRthjaandthepowerdissipationPtot:
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