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TPA3221: Minimal load impedance

Part Number: TPA3221
Other Parts Discussed in Thread: TPA3244, TPA3118D2

Tool/software:

Hello

TPA3221' product details section on the web page (https://www.ti.com/product/TPA3221) state min load is 1Ohm, but it isn't explicitly provided in the data sheet. 

Could you let me know if 1 Ohm can be actually used for a load and in what operation mode (PBTL or something else)?

Thanks

  • hi, 

    we don't recommend using 1ohm as the load.

    as it will make the oc happen very easy.

    that 1ohm in DS is just for testing the peak oc current.

    thanks

    jesse

  • Hi Jesse

    Do you mean a false alarm OC condition or a real one? 

    What minimal impedance do you recommend then for each operation mode (SE, BTL, PBTL)?

    What about other ICs, like TPA3244, is it ok to use 1.5Ohm in SE and 1.6Ohm in PBTL or it's also not recommended? The same question also about TPA3116.

    Thanks

  • hi Zeng

    the most often minimum speaker load is 3ohm. considering 10% variance the minimum is around 2.7ohm.

    below this value, we don't have the experience about it. also no strong validation data at this situation.

    customer has to verify this situation by themselves.

    2 points need to be considered:

    1.the OC problem. 

    2.the thermal problem.

    thanks

    jesse

  • Hi Jesse

    I must say that I'm a bit surprised to hear (read) that. What do you mean by the absence of strong validation data? According to the TPA3118D2 data sheet (see the screenshot below), they can work with load impedance as low as 1.6 Ohm. Is this statement wrong and recommended conditions are different from those? 

    Also, going over the data sheet doc, I can find plenty of plots done at RL=2 Ohm (for example Figg. 20-24). 

    Please advise what are actual TI recommendations for this IC.

    Thanks

  • hi zeng

    if the datasheet described the minimum load, then it definitely be verified.

    what i mean is in our some devices, we haven't wrote the minimum load in DS. then for those devices, the 1ohm, 2ohm usually will not be recommended.

    so, in conclusion, if our DS put the minimum load resistor value, then that will be ok to use.

    otherwise, we don't recommend for that as the reason i explained in last comment.

    thanks

    jesse