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TPA3118D2: Multiple amplifiers drive the same load

Mario Raffin
Expert 2405 points
Part Number: TPA3118D2


My company some time ago developed a board where four TPA3118D2 modules, each configured in mono mode (PBTL) with one Master and three Slaves, drive the same load.

The design aims to achieve much power and it works fine. I wonder if there is some application document for this configuration. In am mostly interested in the minimum load impedance: is still 1.6 ohm or, since the current 1/4 for each module, I can drive even lower loads? Is the 1SPW mode allowed with this configuration?

Thank you.

  • 0
    TI__Mastermind 24835 points

    Hi Mario,

    Thanks for asking question on E2E. This is a very rare application case, could you please let me know the reason that the 4 amplifiers are using the same load? Is it for achieving a high current on the load, or for a high efficience, or something else? We don't have the data for this kind of application currently, so please let us know more about the backgound of your application so that we can try to do analyzation and measurement on this case.  

    Best regards,

    Shawn Zheng

  • 0 in reply to Shawn Zheng
    Expert 2405 points
    Hi Shawn, thank you for the reply.
    Yes the 4 amplifiers are using the same load. The amplifiers are powered at 24V.
    The reason of the design is to achieve more power on the same load, we have tested the amplifier at 160W on a 2ohm and we are going to test 200W on a 1,6ohm load.
    In principle 2 modules should be enough but using four modules we are able to dissipate the heat more efficiently since the amplifier has to be enclosed on a IP68 box.

    Best Regards,
    Mario