Part Number: TPA3255
What I mean by "use only two channels" is to leave one of the output pairs unpowered. For example, do not supply power to PVDD_CD.
I have a prototype board that I designed to work on Stereo BTL (M1 and M2 connected to GND), but I left the two PVDD power supplies independent, so that I can just use the pair A, B as a differential amplifier and leave C and D unused; in which case, I would want to leave them unpowered, so that they do not waste power switching the outputs to produce at 0V signal that I'm not using.
When I do that, the CLIP signal activates. I didn't try feeding audio to A,B and listening to it — maybe it will just work? (however, it would be unfortunate that the CLIP functionality is rendered inactive; when there _is_ clipping or overheating on the pair A, B, I will not know, since the CLIP signal is always active)
Is there something else I need to do or configure to use the chip in this manner?
I can't recommend that you leave PVDD_CD unpowered. This hasn't been tested so it might cause issues internally and we can't guarantee the device's performance. However, TPA3255 supports a 1xBTL mode where OUTC and OUTD won't switch! To configure see the table below:
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In reply to Robert Clifton56:
Thanks Robert for pointing out this detail !
In my board, I provisioned configurability for M1,M2, but not for the input signals. I guess it's easy enough to leave the DC-blocking input capacitors unpopulated and just solder short wires to DVDD and GND (for inputs C and D, as the table indicates).
In reply to Carlos Moreno1:
I'm glad I was able to help you! If you have any further questions feel free to create another E2E thread!
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