[sdiy] Latch-up question

[René Schmitz]

Theo wrote:
> Just a little addition.
> To see how they behaved I tried to make TL07x latch-up but failed.
> Later noticed in the data sheet the TL08x and TL07x indeed only phase
> reverse but don't latch-up.
> Normal operation is restored as soon the inputs conditions are back within
> limits.

Right, but only if there is no second "remote" feedback loop which turns 
into a positive feedback when the opamp is phase reversed. That is what 
happens inside filters and actually causes the latch up effect.

> Didn't try this but maybe the TL07x could be used as a window comparator
> using the phase reversal as a feature?
> Above a positive threshold the output in high, and below the negative input
> limit the output also goes high.

Indeed that could be done.

Cheers,
  René




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