Other Parts Discussed in Thread: TPA6211A1
My customer is planning to use our TPA6211A1-Q1 to drive a 1W speaker with 8Ω load at Vdd = 5V with max Ta = 85°C . From the spec table, we show the following:
Taking derating into consideration, we land on ~1.11W at Ta = 85°C:
Couple of questions on this:
1) Why does the Po spec indicate 1.36W typical with an assumed Ta = 25°C, however the dissipation ratings show 1.36W at Ta = 70°C?
2) I assume the limit to the output power primarily comes down to a thermal limitation of the device, correct? If this is the case, why does the TPA6211T-Q1 have the same Po and dissipation derating specs with a drastically better Rthetaja spec?
3) What is the max output power for Ta = 85°C? If 1.36W is a typical number, I assume the dissipation rating of 1.11W is also typical. I need to ensure I can at least supply 1W @ 85°C.
Thanks for the clarification!