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Hi,
I am testing with the BT+3116+speaker module. I do test successfully with the BT module I built together with the EVM board and speaker part. Now I am trying to apply that on my self-designed PCB board. The only thing I changed now are the values of the LC filter part(from 680nF and 10uH to 15uH and 470nF), others all following the typical application on the 3116 datasheet. I got much noise now, which can hardly hear the music. Why do this kind of thing happen? I have two guesses:
1. The change of LC filter value
2. I placed wrong layout of inductor on the PCB board, so I am now using the wires for the connection.
Can anyone help me understand why the and where the noise come from?
Hi, Molly
1) check the input capacitor. It should be 1uF, you can find the capacitor in TPA3116D2EVM (C1/C2/C3/C4).
2) check the bootstrap capacitor (Need be soldered normally), the value should be 0.22uF, you can find these capacitor in TPA3116D2EVM (C10/C12/C14/C16).
Maybe you can send the schematic to us for a review.
3)Check the PLIMIT pin voltage, it should be 7V if you did not change the voltage divider resistors.