Hi Guys,
My customer is using TPS8208x on their design. In testing, they found the output ripple is almost 3% of Vout, much larger than the datasheet specs. Especially when they vary the Vin.
Here is their schematic, I found their Cin is way too small, and asked them to increase it. They said it makes things worse.
The layout also looks suspect, but I wasnt sure if that would actually cause issues with poor output ripple performance.
Lastly, I have not confirmed if they are using good probe techniques, so that could potentially be the problem too. I figured I would at least pass this along in case you see anything I don't. Could a feed forward cap make the ripple better? or just more Cout?
Thanks,
Brian