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Hi I am designing a class B amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board (see below).

I have tried building out this circuit on a breadboard with components of the values given below, but could get no output despite rechecking the circuit several times. I believe this might be because there are requirements beyond the values given on the schematics, specifically for the output inductors and capacitors (e.g. series resistance).

Can anyone advise me on how to select proper components for the output circuit?

enter image description here

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  • \$\begingroup\$ This question is too broad as-is. What troubleshooting steps have you taken? Have you taken measurements on your circuit? Which parts work and which don't? \$\endgroup\$ – evildemonic Apr 16 at 22:51
  • \$\begingroup\$ I have asked a new question which clarifies the issue and provides more information here: electronics.stackexchange.com/questions/433092/… \$\endgroup\$ – Emmett Palaima Apr 17 at 18:17
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You should make the detailed circuit with all parts values shown on the datasheet, not guessing about the parts on the assembled evaluation board. It has high frequencies so it needs a proper pcb, not a Mickey Mouse breadboard.

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  • \$\begingroup\$ I did get component values from the datasheet. See the schematic I posted. \$\endgroup\$ – Emmett Palaima Apr 17 at 16:34
  • \$\begingroup\$ Also while I realize that breadboards are non-ideal for high frequency they still work for proof of concept. I am not looking for audiophile quality, I just want to verify that the circuit works to drive a speaker with my selected components. It's not like I'm designing a GPU circuit over here, the only things a breadboard should add are noise and a slight amount of series resistance. \$\endgroup\$ – Emmett Palaima Apr 17 at 18:20

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