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TPA3221: Recommended Gain settings and Parallel speakers in PBTL config

Weiwei Su
Prodigy 230 points
Part Number: TPA3221
Other Parts Discussed in Thread: PCM5102A

Tool/software:

Hi Team,

I'm planning on using TPA3221 to drive two 4 ohms 100W speakers in PBTL configuration, so if I connect it in parallel, that would make the effective RL become 2 ohms and the total output power in 10% THD+N is 208W? Would that make sense?

Also, I'm using PCM5102A as the DAC, for a single-ended 2.1Vrms input, what is the best gain setting to maximize the amplifer output power? I'm a bit confused in 9.3.2, the Vrms value of the corresponding gain settings. Does it mean I shall select the matching gain setting for a certain Vrms input?

  • +1
    TI__Genius 9175 points

    Hi Weiwei,

    Yes, driving two 4-ohm loads in parallel would be roughly equivalent to driving one 2-ohm load. 

    Section 9.3.2 of the datasheet describes the different gain settings. You should set the gain of your device such that the gain is the lowest value to give the output power you want. If your input to the TPA3221 is a single ended 2.1Vrms signal and your goal is to get the 208W into a 2Ohm load, you will need to use either the 24dB or 18dB setting depending on the exact input level and acceptable power level. This would ideally be tested on an EVM or custom board and modified to get the gain desired.

    Regards,

    Ramsey