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TPA3139D2: TPA3139D2

Udesh Singla
Intellectual 540 points

Part Number: TPA3139D2

Tool/software:

HI 

We are planning to use the Amplifier TPA3139D2 , we have the requirement of 2X4W speaker so kindly let us know if we can use this amplifier and what will be the input voltage for this amplifier and confirm the part number also which we will use.

Also please confirm what is the meaning of the below highlighted points.

  • 0
    TI__Mastermind 22260 points

    Hi Udesh,

    You can certainly use this amplifier, I would just recommend using a Pvcc voltage of at least 9V to be able to output 4W per speaker, (assuming 8Ohm speaker impedance), while having a THD+N below 1%. 

    The curve above illustrates what supply voltage is needed for a certain output power in a BTL configuration with an 8Ohm load. 

    The meaning of the first two bullets you highlighted is the max output power in a BTL configuration for the given output load (8Ohm), <1%THD+N, and PVcc voltage. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Intellectual 540 points

    HI Sebastian

    Thanks for your reply.

    We dont have 9V power in our design , we can use 5V power and our speaker is 2X4W so can you please suggest some part which we can use

  • 0 in reply to Udesh Singla
    TI__Mastermind 22260 points

    Hi Udesh,

    You can use this equation to calculate the minimum PVcc required to output 4W. P_RMS = ((PVcc/sqrt(2))^2) / R_Load. 

    If you want to output 4W with a 4Ohm load, you would need a minimum of 5.65V PVcc. This doesn't account for margin to avoid clipping/distortion of the output signal. 

    What is your speaker impedance? 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Intellectual 540 points

    HI Sebastian

    We have one battery voltage which can range from 9V to 12.6V so can you let us know if we can use this voltage for the PVcc power 

  • 0 in reply to Udesh Singla
    Intellectual 540 points

    Please also confirm the complete part number which we need to consider for our design

  • 0 in reply to Udesh Singla
    TI__Mastermind 22260 points

    Hi Udesh,

    You can use TPA3139D2 with a minimum of 9V PVcc to drive 2x4W speakers, assuming the speaker impedance is 8Ohms (or lower) and a THD+N of 1% is acceptable.

    It's important to note that the required min PVcc will change depending on several factors such as speaker impedance, modulation scheme, output filtering, and desired distortion. 

    You can always test this device with your speakers using the TPA3139D2EVM. 

    Regards.

    Sebastian