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TPA6211A1: schematic review

Brian Antheunisse
Expert 5265 points
Part Number: TPA6211A1
Other Parts Discussed in Thread: PCM2900C, , TPA2006D1

Team,

I have a customer with a prelim schematic using PCM2900C, driving a TPA6211 that drives a speaker. Can you guys check for an issues?

The cable from J5 to speaker is about 10 feet.  The speaker itself does not have an amplifier, and is 8ohm.   J0 is the USB interface.  

Thanks,

Brian

  • 0
    TI__Mastermind 20085 points
    Hi Brian,

    The TPA6211A1 circuit seems to be right. But I have a doubt, the LC filter is used to improve efficiency, audio performance, and especially for EMC/EMI requirements in Class-D Audio Amplifiers, but this is a Class-AB Audio Amplifier and it is not necessary to add an LC filter, so why are you adding an LC filter?

    Best Regards
    José Luis Figueroa
    Audio Application Engineer
  • 0 in reply to José Luis
    TI__Expert 5265 points
    Well, we had a mixup with the part number. They are actually trying to use the TPA2006D1 for that U16 socket, hence the filter.

    Would you guys recommend me tell them to switch to the TPA6211A1, because class D amp may not be good to drive a speaker at the end of a long cable.

    Thanks,
    Brian
  • 0 in reply to Brian Antheunisse
    TI__Mastermind 20085 points
    Brian,

    Most of TI's audio amplifiers need an output filter when the output cables are longer than 10cm. You could redesign the LC filter to get a better response or you could switch to the TPA6211A1, but you should take into account that the efficiency and the sound quality would be worse than a Class-D audio amplifier. The advantage is that you could remove the LC filter and reduce the cost.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer