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TL431 voltage reference on more than 36V (to generate 2.5V reference)?

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Zero999:

--- Quote from: magic on March 27, 2020, 07:10:16 am ---In TL431 the cathode is not tied to the reference comparator input like in typical "reference diode" ICs. With a suitable divider, one can set it up for any voltage, like 100V. Or it can be used in a myriad other ways altogether. But it won't work very well if the cathode breakdown voltage is exceeded.

As for the power-on transient, I think it's only a matter of rise time of the power supply. If we pushed it down to nanoseconds, the output stage probably wouldn't turn on fast enough to protect the chip ;D More practically, I'm not sure where the safe limit lies but it's probably still much less than 1µs. Also, whether such brief avalanche causes any harm is another question.

--- End quote ---
I think it will be difficult to get such a short rise time, as long as a suitable current limiting resistor is used, because the parasitic capacitance of the TL431 will slow it down.

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