TAS5411-Q1: TAS5411-Q1 consumption

Hello Sara! Are you referring to the TI EVM, or your own unique end-design? If it is the EVM variables such as the load you are driving as well as the cabling/config, gain setting, switching frequency, etc. have a great impact. If it is your own design than it is totally contingent on the details of your design (components, placement, traces, filtering, etc...). Here are some great resources that can help in either case.

you can also find more info here: focus.ti.com/.../litabsmultiplefilelist.tsp

and here: www-s.ti.com/.../SLEA028 & www-s.ti.com/.../SLEA038

and some more in the early www-s.ti.com/.../SLAA117

or: e2e.ti.com/.../2744.Audio-power-supplys.pptx

thanks, Jeff

Hi Sara,
The data you need is in the datasheet, but one just needs to interpret it. You want 8W of power to be delivered continuously to the speaker load. The is device will have 80% system efficiency per the graph. Excluding any other power sources, such as a 3.3V supply, the power supply will need to supply 8W/80%=10W. With a 12V power supply, the current needed is 10W/12V=-0.83A. This is just enough, but as we know with audio if is dynamic an can have peaks that require more current. I would assume that you may need an additional 30% of current for these peaks which give you 1.08A, so use 1.1A for you 12Vdc supply for the amplifier to be safe. Any other power in your system needs to be added.
Storage or bulk capacitance on the 12Vdc supply is needed for both the stability of the power supply and for proper audio output. Please refer to the application circuit diagram in the datasheet.