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LM4782 3-Channel Audio Amplifier DC Application

Tim Canales
Prodigy 40 points

Considering using the LM4782 as an output stage for a direct coupled (response is DC to a few kHz) amplifier.  Are there any known issues with this type of application for the LM4782?

  • 0
    TI__Mastermind 20085 points
    Hello Tim

    It is recommended to use input capacitors in order to avoid DC offset in the amplifier. Unfortunately, this device is "lifebuy" maybe you could consider to use another device.
    Please let me know your opinion.

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer | A-Team
  • 0 in reply to José Luis
    Prodigy 40 points
    Jose,

    The offset condition would not be a concern for my application as the LM4782 would be placed inside a control loop that has a very low offset amplifier as the controlling element for the LM4782 output stage. The entire loop will be DC coupled.

    Vin >>>>>(Low Vos amp)>>>>>>(LM4782)>>>>>>>>>>|>>>>>(DC Load)
    ^<<<<<<<<<<<<<<(feedback)<<<<<<<

    Lifetime buy is a concern.

    Thank you.
  • 0 in reply to Tim Canales
    TI__Mastermind 20085 points
    Tim,

    If the device has a very low DC offset, I think that you shouldn't have any issue with your application. But you should take into account that the device is "Lifebuy".

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer | A-Team