The customer uses 1 cell battery to power TAS2563.
The customer want to know when the battery voltage decreased to 3V, what is maximum power and THD+N performance.
Do we have any related test data/report?

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Hi Fabio,
The datasheet gives us an idea of your scenario. You can see that Pout is about 5 W before hitting 1% THD+N. We tested this in the lab to confirm and got close to this value as well.
Hope this helped.
Best,
Andrew