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TPA3138D2: PLIM characteristics

Mochi
Genius 3865 points
Part Number: TPA3138D2
Other Parts Discussed in Thread: TPA3131D2

Hello,

 

Our customer switch D-amp from TPA3130 to TPA3138 on new project.

They are enabling PLIM function to manage power supply current from Battery or DCDC.

On his evaluation result shows TPA3138 PLIM characteristics is not similar manner with TPA3130.

Attached is output voltage waveform of TPA3138.

When push input signal voltage more and more then output is not saturated. It is increasing again.

TPA3138D2 PLIM.pdf

On the other hands, TPA3130 PLIM create clean flat top output waveform.

How can we get same PLIM characteristics on TPA3138?

 

Regards,

Mochizuki

  • 0
    TI__Mastermind 19110 points

    Hi Mochizuki,

    Did they both used 1SPW mode for 2 devices?

    I suggest they can use BD mode to check again. 

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Genius 3865 points

    Hi Derek,

     

    Our customer is developing USB powered product.

    PVdd is 5V, however TPA3138D2 UVP is 7.5V at BD mode and 3.4V at 1SPW mode.

    So their choice is only 1SPW mode this time.

     

    On TPA3131D2 datasheet we can find output power vs PLIMT voltage characteristics as attached.

    What was TPA3138D2 1SPW mode PLIMT characteristics at your verificationt?

     

    Regards,

    Mochizuki

    tpa3138d2 UVP.pdfTPA3131D2 PLIM.pdf

  • 0 in reply to Mochi
    TI__Mastermind 19110 points

    Hi Mochizuki,

    We have the PLIMT vs Pout at BD mode.

    Test condition:

    PVCC=12V, 4ohm load, 10% THD, BD mode.

    Please see the attached picture.

    Is it OK for customer?

     

  • 0 in reply to Yanming Gong
    Genius 3865 points

    Hello Yanming,

    Thank you for the data.
    Our customer is developing Battery/USB drive amplifier utilize with 1SPW mode.
    Is there the data at 1SPW mode, or PLIMIT is not properly work at this mode?   

    Regards,

    Mochizuki

  • 0 in reply to Mochi
    TI__Mastermind 19110 points

    Hi Mochizuki,

    I am sorry, we do not have 1SPW data. But I can capture 1SPW data on EVM board.

    You can send e-mail to me to provide customer more detail requirement.

    My E-mail is: derek-gong@ti.com 

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Genius 3865 points

    Hi Derek,

    I will post your mail box about our customer's project requirement.

     

    Anyway, in BD mode UnderVoltageProtection kick in at 7.5V, in 1SPW mode UVP is 3.4V.

    So, in USB application BD mode is not suitable.

    They expect to enjoy the benefit of following description on the datasheet together with PLIMT function.

     

    the 1SPW mode, it consumes a low idle current of

    only 21-mA (12-V) and can operate down to 3.5-V,

    allowing for longer audio play and improved thermal

    performance in bluetooth speakers, battery-powered

    appliances and other power-sensitive applications.

     

    Regards,

    Mochizuki