Electronics > Beginners

Discreet startup delay?

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Zero999:

--- Quote from: MiDi on November 30, 2018, 06:32:16 am ---I am wondering how this magic circuit works without having the minimum cathode current on TL431.
Could you enlighten me, please?

--- End quote ---
It doesn't. I put R4 in the wrong place. It should go between the gate and source.

MiDi:
There are special TL431 with much lower minimum cathode current, could worth a look at  ;)

MiDi:
E.g. TI has an advanced tl431 with minimum cathode current of 35uA.

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