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2x TPA3116 in 2x mono (L/R)

CWilson
Expert 1920 points
Other Parts Discussed in Thread: TPA3116D2

Hi,

I'm designing a ~2x100W audio amplifier and have considered the TPA3116.

  • Is it possible to make e.g. one TPA3116 for channel Left and one TPA3116 for channel Right? This means PBTL (mono) for each channel.
  • Do I benefit for driving the outputs in PBTL for 4R (higher output power at 24V?)
  • Should the two TPA3116 be synced together (page 14, figure 27)?
  • How much power can I deliver from 24V supply at 26dB gain to 4R speakers?

As far as I can see, it's not possible to deliver enough voltage swing unclipped for 26dB for 100W?:
Signal 1Vrms * G=20 * sqrt(2) = ~28V peak swing. According to page 17 in the TPA3116D2 datasheet, Pout for unclipped power is about 24*24 / (2*4R) = 72W peak for 24V (see also figure 8, page 8 + figure 14 page 10). So if the voltage swing could go as high as 26V the max power would be 85W peak (unclipped).

Or can I only make a 2x100W into e.g. 2R because of internal current limit? When the IC is in PBTL, the current limit is twice as normal (2 times more current allowed)?

  • 0
    Expert 1920 points

    Nevermind.. I'll be using the TPA3116 at 24V and drive it around 2x70W output. I think it's due to internal limitation that I won't be able to get 2x100W since 100W peak should be possible at 20V rail at BTL. 

    Post closed.

  • 0 in reply to CWilson
    TI__Mastermind 37045 points

    Hi Wilson,

    In PBTL, 24V, 3R load, you can get close to 100W at 10%THD+N (fig 25). You can use lower imped load for better THD (less clipping) but make sure you have an awesome heat sinking strategy to keep it cool when running continuous Po.

    reg,

    Paul.