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TAS5731M: TAS5731M Mid-Z ramp Function

Yu Seven
Intellectual 450 points
Part Number: TAS5731M


Hi Support

I need to use Mid-Z ramp function and I wanted to know any impact if I use it.
I use BTL 2.0

  • 0
    TI__Mastermind 24835 points
    Hi Steven,
    Why do you want to use MId-Z ramp in BTL mode? It's only optimized for SE or 2.1 mode to improve the pop noise performance. So please don't enable this feature in BTL mode.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Intellectual 450 points
    Hi Shawn

    We have a problem that a woofer is located very close to the output filter of TAS5731M.
    When powering up, TAS5731M error register 0x02 -> 02 that it seemed to be over-current protection
    No audio
    If I set 0x05 to enable Mid-Z ramp to enable, this issue is gone.
    That is the reason why I need to enable Mid-Z ramp
    There is nothing to do with pop sound
    We cannot change any capacitor on board.
    We wanted to update the firmware to fix this issue

    If use Mid-z ramp on the BTL have any problem or issue?
  • 0 in reply to Yu Seven
    TI__Mastermind 24835 points
    Hi Steven,
    Thanks for your explanation. Is it possibly caused by the inductor saturation during setting up the common voltage on the output? Did you try to use a higher saturation current inductor? How much PVCC are you using? If it's higher than 18V, please make sure the register 0x10 is set to the value 0x07. Did you compare your SCH to our EVM design and find potential issue? www.ti.com/.../slou331a.pdf
    Basically the Mid-Z ramp shouldn't cause performance issue in BTL mode during paying, but it's not a recommended work mode, so we didn't validate this mode fully and not sure the reliablity/stability.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Intellectual 450 points
    Hi Shawz

    Wanted to further clarify Mid-Z ramp enable
    It is intentional applied to 2.1
    For 2.1 configuration, out A and out B is SE connection.
    out C and out D are BTL connection.
    Does Mid-Z ramp only affect out_A and out_B? It does not affect out_C and out_D, isn't it?
  • 0 in reply to Yu Seven
    TI__Mastermind 24835 points
    Hi Seven,
    The Mid-Z ramp is only used to avoid the pop noise in SE mode, because the pop noise could be an issue for SE output mode as you know. I don't think the Mid-Z ramp could affect the audio performance in BTL mode, but not sure the reliability because this is not a typical applicaiton and we don't have validation data for it.
    Best regards,
    Shawn Zheng