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Using multiple TPA3110D2 Class D amplifiers

John Guy1
Prodigy 100 points

Other Parts Discussed in Thread: TPA3116D2, TPA3130D2, TPA3118D2

Hi - I was considering these for a design, and wanted to use 2 per PCB. I searched here and saw some mention of the TI architecture not having an issue with beat frequency, but another post where it seemed it might...

Are these OK to use without a SYNC signal? Assuming good layout, grounding, bypass, of course.

Thanks

John

  • 0
    TI__Guru**** 189401 points

    Hi, John,

    Long time, no talk!!!!!!!!!!

    Since it seemed like very few customers ever used the SYNC function in our devices, we left it out of this one to save pins. And, you are correct, with a good design, beats can be essentially eliminated.

    However, some customers have constraints in their systems, so we have actually put this in our latest and greatest product, the TPA3116D2 family. Take a look at the TPA3130D2 which is similar power level (but, unfortunately a slightly larger package). We are actually planning on dropping this into a QFN package which might be good if you're space constrained.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 100 points

    Thanks, the TPA3118D2 looks to be good. Smaller would be better, but I am trying to avoid the QFN type packages. Now a question on the 3118: The data for performance is all taken at 400kHz is seems. Is there any disadvantage to operation at the higher switching frequencies? There's no data in the datasheet on this. I assume supply current would rise, but what else?

  • 0 in reply to John Guy1
    TI__Guru**** 189401 points

    Hi, John,

    Unfortunately, we didn't put any data for the higher switching frequencies in the d/s. Quiescent loses are indeed higher, but other than that, nothing too exciting. We didn't spend a lot of time optimizing output filter values - that would be good to do! Maybe I'll have one of my guys look at that and we can generate some data (some day...).

    -d2