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TPA6120A2: About balence output current

liang ren
Intellectual 420 points
Part Number: TPA6120A2
Other Parts Discussed in Thread: OPA627

HI

  I would like to use one tpa6120  to get balence output voltage shown in the pic attched.  I am calculating the output current like this (assume  output resistance =0) :   20v/32=  0.625A.  So the tpa6120 will output 0.625A ?  and what is the relation bettwen 0.625A and 10v output voltage (U=I*R) ?  

  • 0
    Intellectual 420 points
    and the total current of consumed is 0.625*2 or 0.625 ？
  • 0 in reply to liang ren
    TI__Guru** 102215 points
    Hi Liang,

    Total current consumption is not the same as output current. It depends on the efficiency.
    This is not a common use case of the device, so current consumption is not specified for this specific case. An EVM can be used to test the device performance and current consumption.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Intellectual 420 points

    I  found some product using this balance circuit， so I would like to design a first version directly，but it is better to have a estimattion of one chip power current . I am not sure if  a  700mA  margin is enough for one  chip.  

  • 0 in reply to liang ren
    TI__Guru** 102215 points
    Liang,

    What package are you intended to use: DWP or RGY?
    I can provide some current consumption measurements obtained with EVM, if that helps you.
    Please let me know some specifics so I can test like:
    - You need to drive +/-10Vpp at the output?
    - Load impedance; is 16 and 32 ohm OK for testing?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Intellectual 420 points

    Hi  , that will be great helpful .

       The detail specifics is :   +-10v power supply for tpa6120,  consider the mini load 16o, and the input balance signal is acturely +-8.5v pp because of the PGA2130' s limit . there are two tpa6120 in my design, but we can take one chip for test .  (the whole system include 8 opa627, one ak4497,  two PGA2130,  and two TPA6120. all work in +-10v power, except ak4497 on 5v) I would like use  two +- 1.5 A ldo power supply.

  • 0 in reply to liang ren
    TI__Guru** 102215 points

    Hi Liang,

    Below are a couple tables with current values, please note that the current value in the table is the addition of both (positive and negative) supplies. Based on this I think your 700mA is a good current range for 1 unit.

    16Ω
      mA
    Idle 38
    1kHz @ 1%THD+N 550
    1kHz @ 10%THD+N 628

    32Ω
      mA
    Idle 38
    1kHz @ 1%THD+N 400
    1kHz @ 10%THD+N 450

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • 0 in reply to Ivan Salazar
    Intellectual 420 points

    Hi Thanks a lot !

     This is great helpful, and also I think this can be add to the datasheet as a common use . And one question ,  the 10% THD+N is too high for hifi use, so do you record the input pp voltage when the THD+N is 1% ?