45W mono or 23W stereo — matching the speaker load to the BOM
The TAS5806MDCPR is a Class-D audio amplifier from Texas Instruments that delivers 45W into a 4Ω load in mono mode or 23W per channel into 8Ω in stereo mode. That power stage runs off a 4.5V to 26.4V supply, while the digital control logic uses a separate 1.62V to 3.63V rail — two independent regulators on the board, not one.
Industrial temperature range limits the deployment envelope
The exposed-pad HTSSOP package is MSL 3 out of the bag; if the moisture-barrier bag has been open past the floor-life window, a bake before reflow is required.
Dual supply rails — two regulators, not one
The 1.62V–3.63V digital supply powers the I²C control interface and internal logic; the 4.5V–26.4V power-stage supply feeds the output bridge. A common mistake is trying to run both from a single rail — the power-stage voltage sets the output swing, and dropping it below 4.5V shuts down the amplifier. The digital rail can be 1.8V or 3.3V depending on the host controller's logic level. Both rails must be present and within range before the device exits shutdown.