TAS3251: Audio Output Lost After Re-initialization During Playback (Same Issue on EVM & Custom PCB)

Tool/software:

Hi TI team & experts,

I’m encountering an issue with the TAS3251 amplifier, and the same behavior occurs on both the TAS3251 EVM and my custom PCB. Here’s the detailed scenario:

1. Initial Setup & Normal Playback:

   • I configured the EQ in PPC3 and successfully initialized the TAS3251 via MCU (using the PPC3-generated script).

   • Audio playback works fine at this stage.

2. Problem When Re-initializing During Playback:

   • While audio is playing normally, I try to switch EQ effects by re-running the initialization script (exported from PPC3).

   • After re-initialization, the audio output stops, and no sound is produced.

3. Troubleshooting Attempts:

   • The PPC3-generated script includes shutdown & re-enable sequences for the TAS3251, which should theoretically allow seamless re-initialization.

   • I also tried performing an AMP RESET before re-initialization (as suggested in the docs), but it didn’t resolve the issue.

Question:

• Has anyone encountered this issue before?

• Is there a specific sequence or register setting required to safely re-initialize the TAS3251 during playback?

• Could this be related to timing, register conflicts, or PPC3 script generation?

Any insights or suggestions would be greatly appreciated!

Best regards,
Roger