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TPA3116D2 performance by higher switching frequency

Tomasz Chumiecki
Genius 3070 points
Other Parts Discussed in Thread: TPA3116D2, TPA3118D2, TPA3116D2EVM

Hi TI expers,

The audio performance (THD+N, output integrated noise, etc...) of TPA3116D2 / TPA3118D2 is specified in the d/s @ 400kHz switching frequency.
Could you tell me, what can I expect going up with the switching frequency? Can I expect lowering idle noise and better THD+N performance?

Cheers,
Tomasz

  • 0
    TI__Expert 4320 points
    Tomasz

    noise will be the same, as it is limited by the input stage noise.
    THD is a litle better with 600kHz - but penalty is a litle higher idle current and a litle lower power stage efficiency.
    The TPA3116D2EVM have jumpers for the AM0-1-2 pins to make it easy to measure and listen to.

    rgds,
    Kim
  • 0 in reply to Kim Nordtorp Madsen
    Genius 3070 points
    Kim,

    thanks a lot for your replay. Unfortunately I have no EVM and my own board has no option to change the switching frequency. I have an idea for a active speaker to drive the bass section from one TPA and the tweeter from the second one - maybe I can set the 400kHz switching frequency for the LF section and the 600kHz for the tweeter amp...

    Best regards,
    Tomasz
  • 0 in reply to Tomasz Chumiecki
    Prodigy 50 points
    Hi Kim,

    I'm curious if TI has figures for the actual efficiency loss when moving from 400-1200kHz? If you don't, and I need to measure this myself, is there a particular signal that's used for efficiency testing, or is it just a sine wave at a specific frequency? I'd imagine a wide bandwidth signal would be the best measure, but I'm not sure.
  • 0 in reply to Jonathan Moeller
    Genius 3070 points
    Hi Jonny,

    I would stick with 1kHz sine wave comparing different operation conditions. Calculating the switching circuit efficiency is, I guess so, extremely difficult even for the IC vendor. I tried to estimate the switching losses of my amplifier, but I still have to make some more measurements... I use 1kHz sine wave.

    Cheers,
    Tomasz