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TPA3255: Design issues

Part Number: TPA3255

Hi Dear,

The customer is looking at TPA3255 and has the following questions:

1. In the manual, for each BTL, 8 ohms per channel can achieve 155W, but the first page of the manual mentions a total power of 150W. As the following two images?How to understand this?

     

2. How to connect signals to the four input channels INA/B/C/D when using BTL mode to drive two speakers? Do we all need to connect signals?