Hi Team,
My customer is having query on TPS549B22 simulation.
Attached the Simulation report for your reference. Waveform shows ~17.5mVpp but report shows 3.973mV. Can you please clarify.
Regards, Shinu.
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Hi Team,
My customer is having query on TPS549B22 simulation.
Attached the Simulation report for your reference. Waveform shows ~17.5mVpp but report shows 3.973mV. Can you please clarify.
Regards, Shinu.
Shinu.V.Mathew, can you please share the WEBENCH design with me so I can open it in WEBENCH to take a look at it?
Hi Shinu,
Thanks for sharing the design. I need to check with the WEBENCH team on how this is being calculated, and also what capacitor models are being used in the simulation.
Please give me a few days to get some clarity with the team on this.
Regards,
Kris
Hi Kris,
we are looking into it and will get back with our observations.
Thanks,
Kiran Kumar
Hi Kiran
We need the details ASAP. Please help to provide early.
Regards
Srikanth Kacchu
Hi Srikanth,
Our expert who is working on this issue is currently out of office and will return next week. We will get back to you by next week with the update on this.
Shaheen S M
Hi Srikanth/Shinu,
The voutpp calculation on webench is an estimation which includes the calculation of ripple due to capacitor and ESR (below link for documentation Eqn 12 and 13) and ignores ES.
https://www.ti.com/lit/an/slva477b/slva477b.pdf?ts=1612326636801&ref_url=https%253A%252F%252Fwww.google.com%252F
In case of above device we observed that for ceramic capacitor the calculations are matching well but for Electrolytic and Ceramic combination values are bit off. We updated the voutpp calculation for this device. Please note that typically there will be some difference between estimation and electrical simulations as simulations will be much more accurate compared to estimation. For your case we were able to reduce this difference to some level but for accurate estimation we recommend to run the electrical simulations as well. Hope this clarifies. The fix for this device should be available on ti.com by end of next week.
Please find the latest design report below for the condition (VinMin:4.5V ; VinMax:5.5V ; Vout:0.8V ; Iout:16.5A).
Best Regards,
Kiran Kumar