I am working on a design that only requires a 15V rail to hit my power targets. Disregarding the requirements of GVDD_X, and VDD (clearly stated in data sheet) is 15V at PVDD_X within the recommended operating limits? The data sheet lists the minimum recommended at 0V, but this is unrealistic.
I would then couple this with a low voltage detect circuit that would trip and place the TAS5342 into reset around 12V, and would thus need to operate down to around 12V.