Could you tell me how calculate the junction temperature base on the case(top) temperature?
The case(top) temperature is 95.26℃ and the Power consumption is 0.51W in measurement
If I use the <Junction-to-case (top) thermal resistance> RθJC(top) is 98.7℃/W
the junction temperature Tj= 95.26+0.51*98.7=145.6℃ and over the operating temperature(125℃)
However, If I use the <Junction-to-top characterization parameter> ψJT is 6.1℃/W the Tj will be 98.37℃
What difference about the RθJC(top) and ψJT?
And any other methods to junction temperature?