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TPA3138D2: How to set the Plimit for TPA3138D2 ?

Tony Jin
Prodigy 30 points
Part Number: TPA3138D2

Hi there , 

I am using TPA3138D2 with 3W speaker and the PVCC is 8V, do you have suggestion for the Plimit configuration ?

Thanks 

Tony

  • 0
    TI__Mastermind 19650 points

    Hi Tony,

    What's the load impedance?

    For 4ohm load, according to the Rson and Rtrace, the Vpp of the output should be 5.5V for 3W.

    The Vpp of the output is approximately 5.7 times (with BD mode) and 11.4 times (with 1SPW mode) the voltage at the PLIMIT pin.

    So the voltage at the PLIMIT pin should be 0.965V

    Regards,

    Derek

     

  • 0 in reply to Yanming Gong
    Prodigy 30 points

    Hi Derek , 

    Thanks for your quick reply .

    The load impedance is 8 ohm , so the VPP of output should be 7.3V

    7.3/5.7= 1.28V , the two resistors(10.2K and 2.2K) can be selected to divide the GVDD volatge to make the voltage on the PLIMIT around 1.28V .-am I right ?

    Thanks 

    Tony

  • 0 in reply to Tony Jin
    TI__Mastermind 19650 points

    Hi Tony,

    That's ok.

    You should consider the trace loss, you can tune the value on EVM board or on your board.

    Regards,

    Derek