The base-drain Q1 and Q2 can of course be used. The problem is that the
base-drain voltages to temperature is only approximately known. You would
need to calibrate those, using external heating. As they can be be expected
to be linear, you only need two or three temperature points for an decent
In order to understand the dynamics of the LTZ1000 temperature
regulation loop better in order to estimate the chip temperature
response due to ambient temperature fluctuations, I am attempting to
produce a model of the thermal impedance of the chip by fitting a Foster
RC ladder (later
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