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TAS5720L: question about output filter

lifang lu
Intellectual 320 points
Part Number: TAS5720L
Other Parts Discussed in Thread: TAS5720M

Dear TI,

TAS5720L/M is a class-D amplifier,and the output can be filter-free,right?

But different stuff options are recommended for TAS5720L & TAS5720M,why TAS5720M need LC filter?

  • 0
    TI__Genius 9995 points

    Hi Lifang,

    Can you provide your design specification for your system? Like PVDD voltage, load=?ohm, the maximum output power?

    As to the TAS5720L and the TAS5720M, main difference is the voltage rating for PVDD. L means lower votage rating.

    Usually, for filter free design, considering EMI/EMC performance, we only recommend this design in lower power design with lower PVDD. 

    For TAS5720M which is mainly for higher power design, LC design is a must to deliver large output power without EMC concern.

    Thanks.

    BR.

    Alix Wan.

  • 0 in reply to Alix Wan
    Intellectual 320 points

    Hi Alix，

    Thank you for your reply.

    Our PVDD is 12V,and we use TAS5720L.

    So filter is not necessary for audio performance,it's just design for EMC attenuation?

  • 0 in reply to lifang lu
    TI__Genius 9995 points

    Hello customer,

    As to TAS5720L, LC filter is recommended for reasons below:

    1. EMC: this is a mono device, EMC is hard to pass if no LC is used even on your condition;
    2. Performance:
      1. Efficiency & thermal: LC help to improve the efficiency compared with ferrite bead;
      2. THD+N: of course, LC helps to improve the THD+N performance compared with ferrite bead

    BR.

    Alix Wan.