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how to calculate the TPA2038D1 input current

liting Lei
Intellectual 295 points
Other Parts Discussed in Thread: TPA2038D1

I'd like to know how to calculate the PA(TPA2038D1) input current(peak and average) for a two 0.7w(8ohm) speaker application.

 

best wishes,

Jacky

  • 0
    TI__Guru**** 189399 points

    Hi, Jacky,

    That information is shown in Figure 6 of the TPA2038D1 data sheet.

    Let me know if you have any further questions.

    -d2

  • 0 in reply to Don Dapkus
    Intellectual 295 points

    Hi Don Dapkus:

        I suppose that the current in the figure 6 are the averaged current of input power.

    and what is the peak current? how to calculate it?

    For class D PA, the PA input current should be equal to speaker drain current, right?

    Is there any document presenting on this topic?

    best wishes,

    Jacky

  • 0 in reply to liting Lei
    TI__Guru**** 189399 points

    Hi, Jacky,

    You are correct., this is average current. The peak current will depend on the source material.

    In a class-D amp, the power supply current is not the same as the speaker load current.

    I don't think we have a good document that explains all this. I suggest you contact your local TI Sales Office for more assistance.

    -d2