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TPA3221: Output power PBTL into 8 ohm

Ravi Rajani
Prodigy 20 points
Part Number: TPA3221
Other Parts Discussed in Thread: TPA3245, TPA3220

I am designing a mono amplifier that delivers 50W continuous into 8 ohm at 1% THD, and it seems that the TPA3221 will work, but I only see the data for 4 ohms or less in the datasheet (for PBTL configuration). Can you confirm this device is suitable for this application? Are you able to show me the graphs of the datasheet for PBTL when RL=8 ohm? Also, are there any advantages to using the TPA3245 over TPA3221 for this application apart from the slightly better noise performance of TPA3245?

  • 0
    TI__Guru 61360 points
    Ravi,

    PBTL mode is mostly suited to lower loads like 4 or less because we have more current available after doubling up the outputs. What I would suggest is using the BTL x 1 mode which is new on the TPA3221. This way you get 1% THD at 50W mono.

    The other advantage of TPA3221 over TPA3245 is lower power. The TPA3221 is a newer process technology and is more suited to battery applications or ones in which idle current is a care about. Using HEAD mode accomplishes this with lower duty cycle in idle.

    If you want we have TPA3221 in a full EVM, this uses a heatsink, or we have the TPA3220 (pad down version, no heatsink) in a full and micro EVM.

    Regards,

    -Adam
  • 0 in reply to Adam Sidelsky
    Prodigy 20 points

    Thanks, I hadn't noticed the 1xBTL option.