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TAS5624A Swapping of Input Signal

Other Parts Discussed in Thread: TAS5624A

Hi,

The output terminals of OUT_A and OUT_B is configured to L+ and R+ if swapping the INPUT_B signal for the INPUT_C signal with the BTL configuration.
However, the mode selection pins are "M3/M2/M1 = 010"(BD mode).
So, could you please give us your advice if you have any concerns functionally ?

Best regards,
Kato

  • Hello Kato,

    To clarify you want to setup the device in BTL but use OUT_A and OUT_B independently such like in SE mode?

    My recommendation would be the setup the device in 4x SE mode permanently and connect the lode in BTL as need. Running in SE mode should insure that there are no faults triggered when running a BTL load with the device setup in SE.

    Best Regards,
    Matt
  • Hi Matt-san,

    Thank you for your quick response.

    We would like to use OUT_A and OUT_B in the BTL configuration such like the analog mixer after the post filter.
    How does TAS5624A work if detecting a fault error(OTE, OLP and UVP) when running a BTL load although you recommend to use TAS5624A in the SE configuration("M3/M2/M1" = "101") ?
    Then, could you please tell us any concerns and the reason to use in the SE configuration ?

    Best regards,
    Kato

  • Hi Kato-san,

    Matt is out of office the rest of the week. This is an interesting solution to get (L + R)/2 mixing. The fault protection will work the same for BTL and SE. I do agree with Matt in terms of thinking of the outputs as single-ended channels that are mixed at the speaker. It seems possible to achieve the same solution in BTL (2N+1) or SE (1N+1). I would recommend using AD modulation. With BD modulation I'm concern that there maybe added distortion and the mixing wouldn't be proportional as with AD mod.

    Is there a reason they need to use BD modulation? Is this for a subwoofer channel? BD could work, but I would recommend AD. 

  • Hi Damian-san,

    Thank you for your information.

    I will suggest to use AD modulation(4 x SE) to our customer since there is no reason to use BD modulation.
    So, I have an additional question.
    Should the post filter be applied as the following schematic ?

    Best regards,
    Kato

  • Hi Kato-san,

    Yes use the EVM schematic as the reference for the output filter design.

  • Hi Damian-san,

    Thank you for your advice.

    I understood.

    Best regards,
    Kato