UCD9246: Stability vs. Output Capacitor Tolerance

Hi Steve,

Got the question. Will look into this quesion and reply to you.


Thanks
Qian

I will need to check which value is used in the calculation, I would suspect that the minimum capacitance would be used but I could be wrong.
Switching to Manual compensation would be the way to hold the compensation constant while varying any of the component values.

While this tool will give you a good approximation of the expected response, given the correct component values/quantities, it is limited in its ability to simulate other parasitic properties that may exist in the final design.

It is best to measure the loop response of the final hardware and make any adjustments that may be needed. The Model could be adjusted, if needed, after measuring the loop to match the actual then use the Auto function to make the final adjustments.

A cool feature: The path through the controller is a known value based on the compensation selected, so the tool/controller measurement is made just of the power stage and feedback external to the controller. This makes it possible to manually adjust the compensation after a measurement is taken and the measurement results will update to show what the measurement will be with the new compensation if the measurement were to be run again.

Thanks; please do respond with an answer about what corner of tolerance is used for compensation calculation.

We will certainly be testing things once we get it back, and I'm designing for ~57 deg. phase margin, so I'm not expecting much of a problem here, but I do need to document due diligence.

Thanks again, Best, Steve