Hi,
I am working with the TPA 3125D2 class D amplifier IC. I am having a difficult time getting the circuit to operate well. I have worked with a lot of audio amps over the years, but this is the first class D. The circuit is based on the Evaluation PCB, and mono / BTL configuration.
There is a [ approximately ] 40KHz oscillation that I have yet to be able to find the cause of. It shows up as distortion of course. After building a prototype, everything looked ok, so we built 100. Some just have a low constant 40KHz, some are high enough to cause the output components to become warm.
I have tried re wiring the grounding a few different ways so far, nothing seems to have much effect. Even with the inputs disconnected and terminated.
Thank you,
Dave