We used 2 TDA3118D2 ICs to design a 2.1 speaker system. We did some EMI pre-scan and found serious conducted EMI issues. When we put both TPA3118D2 ICs in shut-down mode, these conducted EMI noises did go away so the source of such noises was confirmed to be from TPA3118D2.
We pretty much followed TPA3118D2EVM design, except that we use Panasonic EXC-ELDR35V bead instead of inductor. Both TPA3118D2 ICs operate in BD Modulation mode and AM2, AM1, AM0 are set to 0,0,0 so the switching frequency is around 400K Hz.
Attached are our audio amp design and the conducted EMI measurement. Any help will be highly appreciated.