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TAS5518-5261K2evm 2 channel audio output, can I connect 1 load to the channels for 2x power?

Robert Correllus
Prodigy 40 points
Other Parts Discussed in Thread: TAS5518, TAS5630B, TAS5630PHD2EVM

I would like to drive  32 Vrms into a 10 ohm load with the EVM ~ 108 W.  Can I connect the L & R channel together to increase the max power?  I would like to drive load with minimum distortion ( no clipping).

I was looking through other post and noticed a PBTL mode.  It seem to be the configuration I am looking for,  If it will provide the needed extra power can I modify the EVM for this output mode?  If so is there a change needed on the drive to the USB-input board to get this type of drive working?

  • 0
    TI__Guru**** 189399 points

    Hi, Robert,

    I did a quick search, and I'm not sure what other post you are referring to. Can you post the url?

    As for PBTL, it should be fine after the output filter. You will need to jump the PWM signal so both ICs get the same PWM signal. Be a little bit careful, any degradation of the PWM signal will directly contribute to audio degrdation.

    You can probably also remap the audio channels in the TAS5518 , but unfortunately, I don't have a lot of experience with that IC, and it's NRND, so we're not providing support for it, either.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Thanks for the information,  as always I'm under the gun to get a working solution.  Do you have a EVM set that will provide the power need, that is also available for overnight delivery.  The system requirements are > 100W into a load of 10 to 20 ohms across Audio frequency range,  this specific implementation is for 400 to 600 Hz.  The final implementation will be driven by a M4 cortex ARM processor.  But if you have a chipset that works out of the box with a signal generator input it will be enough for my proof of concept.

  • 0 in reply to Robert Correllus
    TI__Guru**** 189399 points

    Hi, Robert,

    Unfortunately, with a load impedance that high, all our solutions are going to be voltage-limited. I was looking at the TAS5630B, and if you run it at the maximum recommended voltage of 52.5V, you should be able to get pretty close. If you prefer digital input, a similar device is TAS5630B.

    I believe all our EVMs ship out 2nd Day Air, and it usually takes one day for processing.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Friday afternoon found a TAS5630PHD2EVM at a local supplier that overnight shipped the EVM.  I should have it today.  Thanks for your help.  I will let you know how I make out.