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TAS5713 in PBTL connection

DJ
Prodigy 225 points
Other Parts Discussed in Thread: TAS5713, TAS5727

I am using the TAS5713 in a PBTL configuration and had requested TI tech support insofar as the proper electrical connections. I received the attached drawing showing the connections. I have the TAS5713EVM board which is wired as 2 BTL (stereo) outputs and have noticed that the PCB layout for the boost capacitors on each output were very deliberately connected right at the output filter. Should I followd a similar approach in the PBTL layout, i.e. keeping the OUTA/OUTB and OUTC/OUTD wiring connections separate up to the output filter, as well as the boost capacitor connections for each of these 4 outputs? Does anyone have a sample board routing (i.e. tested) for the TAS5713? connected in PBTL mode ? I'd like to only have to do this once!

Thx,

Dave

  6746.TAS5713-PBTL.pdf

  • 0
    TI__Guru**** 189399 points

    Hi, Dave,

    Take a look at the TAS5727 EVM users guide (here). The TAS5727 is SWEET because it has a dedicated PBTL pin which allows you to throw the two h-bridges in parallel BEFORE the inductor! so, you only need one output inductor per output. TAS5713 will require you to have four inductors (two per output pair). 5727 only requires two total in PBTL mode.

    I think the key thing with the bootstrap layout is it could generate emi, so we strive to make it nice and tight. Lots of signals flying around there...

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 225 points

    Thanks Don. I appreciate your taking the time to respond to this, although I think you discounted the TAS5713 a bit too quick, i.e. it too has a dedicated PBTL line on the part. In fact, the pin-outs of both these parts are nearly identical, with the exception that the separate PVDD pins for bridge outputs B&C have been made "NC" on the 5727 parts, and tied together internally to the PVDD pins for outputs A/D respectively. According to the documenation for the TAS5713, the outputs can be connected before the output filter.

    There do appear to be some pricing advantages to considering the TAS5727, so I will not discount this as a viable option for consideration. It would be nice to know if I can install the TAS5727 in the place of the TAS5713, meaning there would be 24V applied to the NC pins on the TAS5727. If they are truly "no-connect" pins, this might be ok, although I would want to hear it from the horses (aka "chip designers") mouth ;-)

    Dave C

  • 0 in reply to DJ
    TI__Guru**** 189399 points

    Dave,

    You should probably take anything I post at 1:10 AM with a grain of salt! ;-) A lot of times, I've in Asia, posting away during daylight hours, but in this case, I was focused on trying to get a lot of old posts answered - a lot of us have been out of the office the past few weeks, and some threads had gotten stale...

    You are absolutely correct, 5713 also has the PBTL pin. I missed this last night when I checked the d/s. 

    In general, NC means truly that. But, every once in a while, someone pulls a fast one around here and screws it up. Typically for it to be listed as NC, it should not have a bond wire inside, so you can do anything you want to the pin, as long as you don't exceed a voltage to get arc-over to the adjacent pin... 

    Either version would be ok... If you've already done work with the 5713, then stay with it. But, if you haven't done any evaluation yet, you might as well change to TAS5727.

    -d2