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Part Number: TLV2780
We bought one reel TLV2780IDBVR and the Settling time is bigger as always. We use them for a long time and yhis time have a problem.
How can we check if it is original? can we send you the samples to check?
we are planning to use this component for a long time so we need to be sure that the parameters did not change or if they changed we need to know that it is really your decision
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In reply to kai klaas69:
Our schematik has not changed.
In reply to Elena Silinskaya:
It is possible that the original design was on the edge of stable and with a little parameter shift in the devices it no longer is. The best way for us to help you is if you provide the relevant portion of the schematic and some screen shots.
In reply to Paul Goedeke:
We check a few chip from old delivery and new in the same board. We saw a difference in the output signal on the same board and the same input signal.
The part is sheme.
Is it ok now?
I ran a stability analysis on your circuit and have some concerns. My simulation shows only 25 degrees of phase margin which is generally not enough for robust stability. Our ICs will shift parameters device to device so we recommend at least 45 degrees of phase margin to account for part variation and temperature.
It is possible that the reason you are seeing issues now is that a new lot of devices has had a little bit of specification drift (while still meeting the datasheet values) but now your circuit, which has marginal stability, is unstable.
To fix this issue, I recommend a simple fix of tweaking the value of C15. Right now I believe that it is too large - if you reduce the value of this cap to around 400pF, you'll have a more robust and stable circuit.
It would still be useful to see the screenshots of good and bad behavior, that will greatly help with our diagnosis if you'd like further help. I've attached a TINA simulation for you to look at.
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