d123
Advanced Member level 5
Hi,
Please no snarky remarks about the ridiculously unrealistic 33.98251k resistor, only purpose was to get exactly 10.000V in the simulation.
I can't re-create 0ºC to 100ºC here at home nor have appropriate tools to measure the effects on the DUT anyway.
Question: Does simulation result "B" look credible?
I possibly more or less understand the premise of what the diodes do but no idea why it turns the expected "banana" into a "sideways s" either. Diode leakage increases with temperature and draws current away from ref pin, which internally in the TL431 is an NPN base.
Should read more, I know.
Checked without feedback and that has no effect on temperature performance, it's apparently only with the feedback resistors that there is a small improvement in performance across temperature range. One diode helped a little, two a bit more, three spoils the effect. 1N4148 works, 1N4007 was no use and Schottky is pointless.
Thanks.
Please no snarky remarks about the ridiculously unrealistic 33.98251k resistor, only purpose was to get exactly 10.000V in the simulation.
I can't re-create 0ºC to 100ºC here at home nor have appropriate tools to measure the effects on the DUT anyway.
Question: Does simulation result "B" look credible?
I possibly more or less understand the premise of what the diodes do but no idea why it turns the expected "banana" into a "sideways s" either. Diode leakage increases with temperature and draws current away from ref pin, which internally in the TL431 is an NPN base.
Should read more, I know.
Checked without feedback and that has no effect on temperature performance, it's apparently only with the feedback resistors that there is a small improvement in performance across temperature range. One diode helped a little, two a bit more, three spoils the effect. 1N4148 works, 1N4007 was no use and Schottky is pointless.
Thanks.