TPA3255 Reference Design Class D Amp with PFFB

[Studley]

@xrk971 : what are the dip switch settings please for mono (PBTL) mode please ?

 

[xrk971]

This board follows closely the TI EVM implementation as far as mode switches etc. Please refer to the section on PBTL in this document.

https://www.ti.com/lit/ug/slou441/slou441.pdf

Essentially you will want to set the DIP switches for M1=off and M2=on per:

And connect C and D input to GND.

This is the diagram for the other stereo BTL and SE quadrophonic modes:

 

[maximax77]

Hi X, sorry I don’t get the instructions for balanced input/BTL output: the table says to leave M1/2 open, your drawing at the bottom left says to close it?

 

[xrk971]

Drawing is for stereo not mono (parallel) BTL. Go with the table. Please read the TI app note for other things needed for PBTL operation.

 

[maximax77]

Ok and for stereo BTL/balanced inputs, I go with the drawing?

 

[Studley]

@xrk971: we are having problems implementing PBTL (mono) mode. Both boards work fine when used independently in stereo mode, but following the EVM guidance for PBTL operation puts them into fault. We need your input please X.