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TAS3251: TAS3251 Replacement model recommendation

Herbert Wang
Intellectual 655 points
Part Number: TAS3251
Other Parts Discussed in Thread: TPA3223, TPA3255, TPA3251, TAS5558, TAS5828M,

Tool/software:

Dear expert:

For this product, the customer means that the power amplifier needs to support both fixed-resistance output (push two fixed-resistance speakers, the internal resistance of the speaker may be 4Ω or 8Ω, hope that the function can be adjusted) and fixed-voltage output (just like the broadcasting system, mono, but can be connected to multiple fixed-voltage speakers, the total power will not exceed the maximum output power of the power amplifier chip). Fixed group output and constant voltage output can be switched, not used at the same time. In addition, the customer also wants the linear output and the speaker output to be used at the same time, but with the output of the above two push speakers using the same power amplifier chip (my understanding, the linear output and the push speaker output do not have to be the same chip, but the customer wants the best) to ensure audio quality. May I ask if there are any recommended devices for power amplifier chip, relay and booster? In addition, the product is divided into two versions, one is Lite version, the constant resistance output push horn is 2*40W, the maximum power of the constant voltage output is 80W; Another Plus version, the constant resistance output push horn is 2*80W, and the maximum power of the constant voltage output is 160W. These two versions hope to directly replace the power amplifier board to achieve replacement, we hope that the two power amplifier boards can use only one PCB, only replace the power amplifier chip to achieve.

can you  recommend Analog power amplifier and digital power amplifier Part number?

  • 0
    TI__Genius 9175 points

    Hi Herbert,

    For constant voltage applications, we have this app note that describes such a setup with the TPA3255 (analog input). Given that constant voltage applications require the amp to drive a coil that typically is low impedance, this would likely be the best option for the constant voltage setup due to the high current limit. For the lite version, you may be able to get away with the TPA3223 or the TPA3251, but they have not been tested with this application before.

    For a digital input, you would basically be stuck with only the TAS3251. The next best bet would be either the TAS5828M which is too low of a PVDD for this application or a combination of a power stage and a modulator (like TAS5558 + TAS5364) which has never been tested before.

    Regards,

    Ramsey