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TAS5754M: Asking for the TAS5754 power cap design

SHH
Mastermind 32196 points
Part Number: TAS5754M

Hi Team,
Cusotmer uses TAS5754 on the new project. Do you have concern if customer uses one 47uf to replace two 22uF cap?

Thanks,
SHH

  • 0
    TI__Mastermind 32196 points
    Hi Team,
    If not recommending to use one 47uF, could you let me know the reason?

    Thanks,
    SHH
  • 0
    TI__Expert 6985 points
    Hello Scott! This is going to be very dependent on their system design, and power supply stability, as they still have to provide a proper PVDD decoupling capacitor scheme to eliminate any ripple/ringing complications on the output. What we show in the datasheet is a best practice recommendation to eliminate any related issues. Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    TI__Mastermind 32196 points
    Hi Jeff,
    Thanks for reply. Customer would like to know what may impact if using only one 47uF?

    Thanks,
    SHH
  • 0 in reply to SHH
    TI__Expert 6985 points
    Hello Scott! Yes they can use a single 47uF cap, but it would likely need to be a can electrolytic type that would be much larger. We used two small ceramic 22uF caps on the reference application, which take up much less space. Cost might also be an issue. Does this help? Thanks, Jeff
  • 0 in reply to Jeff Kohnle
    TI__Mastermind 32196 points
    Hi Jeff,

    customer met the problem on vibration of MLCC based on ripple current transition, then to cause DMIC recording the noise into system.
    ODM have to measure the 19V voltage stable for system other power rails, but kindly advise how to stress amplifier as worst case on power source delivery?

    BTW, if there is no concern putting 47uF*1 per channel of amplifier power source, do we need to have board to validate on amplifier itself careful item?

    Thanks,
    SHH
  • 0 in reply to SHH
    TI__Guru 52115 points

    Hi Scott,

    See my comments below:
    a) kindly advise how to stress amplifier as worst case on power source delivery?
    [Andy] : Allow me to double check with our SH team and get back to you.

    b) if there is no concern putting 47uF*1 per channel of amplifier power source, do we need to have board to validate on amplifier itself careful item?

    [Andy] : I don't see any big risk on using 47uF caps.  As Jeff mentioned, the major purpose of choosing two ceramic 22uF caps on the reference application is to save space.

  • 0 in reply to Andy Liu (BMS)
    TI__Guru 52115 points

    Hi Scott,

    a) kindly advise how to stress amplifier as worst case on power source delivery? 

    [Andy]:  Drive TAS5754M to deliver the maximum output power.