[volt-nuts] Trimming the LTZ1000 tempco
Andreas_-_Jahn at t-online.de
Thu Oct 6 21:37:38 UTC 2011
> It seems that the page 6 trick slightly reduces the tempco but it
> still stays in the 50ppm/C area. Or I have forgot something in my
> calculations. I don't have a spare LTZ1000 available at the moment to
> run the tests but maybe Andreas has time in the future.
But consider: a resistance change on the 200R resistor of page 6
will directly affect output voltage. 200R * 5mA = 1V.
A 100 ppm change of the 200R Resistor has a 1V/8.2V
= 12 ppm change on output voltage.
All other resistors have below 1ppm change with 100ppm resistance change.
So the 200 Ohms resistor will be the most
critical for tempco and ageing in the whole system.
So in my opinion its only worth to consider if you
really need to save the 20-30 mA for the heater.
With best regards
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