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TPA3130D2 Minimum Load Impedance

Bryan Audiffred
Prodigy 100 points
Other Parts Discussed in Thread: TPA3130D2, TPA3118D2, TPA3130D2EVM, TPA3116D2

TI,

I have a TPA3118D2 in a consumer design that is limited to 15W per channel and drives 4 Ohm transducers.  I am evaluating the option of stepping down to the pin compatible 15W TPA3130D2.  The data sheet states the minimum load impedance on this device is 5.6 Ohms for BTL operation.  However, the TPA3130D2EVM eval kit gives a low figure of 3.2 Ohms.  Which is it?

Beyond the packaging difference on the 50W part, what are the internal differences on these devices?  Is it limited to the switching FETs?

Regards,

Bryan Audiffred

  • 0
    TI__Intellectual 1050 points

    Hello Bryan,

    Please see this related post.

    Please note that the 3.2 Ohms minimum in TPA3130D2EVM User Guide refers to the PBTL configuration. In BTL, TPA3130D2 is still rated at 5.6 Ohm minimum, as noted in the data sheet.

    In the User Guide, it briefly mentions "parallel" (unfortunately not separately including "PBTL") in the summary of max and min conditions, but, as prose, doesn't cleanly split the BTL and PBTL case as does the table in the data sheet. 

    Best regards,
    Arnold Zhang 

  • 0
    TI__Mastermind 37045 points

    Hi Bryan,

    The min load impedance is 5.6 Ohms for BTL and 3.2 Ohms for PBTL.

    reg,

    Paul.

     

  • 0 in reply to user5276421
    Prodigy 40 points
    Hi Paul,

    I found different information about minimum load of TPA3118D2.
    Can TPA3118D2 in PBTL configuration drive 2,6 ohm load? (In 'Recommended Operating Conditions' minimum load in pbtl is: 1.6ohm, but elsewhere I find minimum load of 3ohm, or 3,2ohm)

    I don't need excellent audio quality, neither high power (max 20W in pbtl), but I need to drive low impedance load (2,6ohm).

    I would like to be sure that the 'output short-circuit protection' does not disable outputs with a load of 2,6ohm.

    (Next datasheet revision modifies ALSO the device information in first page that indicates "TPA3116D2 DAP (32)" (power pad down) that doesn't exist).

    Thanks for support.
  • 0 in reply to Stefano Rejc
    TI__Mastermind 36865 points
    Stefano,
    The TPA3118D2 has more current capability than the TPA3130D2. Therefore, you will be able to drive the 2.6ohm load. Just remember that a lower impedance load will increase the current and increase the power losses in the TPA3118D2. It is important that you follow the datasheet guidance for the pcb layout to properly dissipate the heat.