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Amplifier Design for Headphone Driver

Prodigy 40 points

Replies: 7

Views: 630

Hi
If we would like to use amplifier design for headphone driver, any recommend amplifier part number?
Thank you.

Vader
  • Hi Vader,

    I would recommend you take a look at the TI.com selection tools for op-amps. It is difficult to know what to recommend without more information on your application. 

    http://www.ti.com/amplifier-circuit/op-amps/overview.html

    There are also TI designs such as this one which might help guide you as well.

    http://www.ti.com/tool/TIPD189 

    Hope that helps,

    Paul

  • In reply to Paul Goedeke:

    Hi Sir,
    I would like to know the root cause of Vp-p is too small come from
    1. component's value choose wrong
    2. OP AMP IC solution choose wrong(HP design need specify OP AMP)
    3. design structure choose wrong(for example to change non-inverting to inverting....)

    Thank you.

    Vader
  • In reply to Vader chen:

    Hi Vader,

    as I already mentioned above: The OPA172 cannot drive a 32R load! If you decrease R70 to 0R then the maximum output voltage is about 2Vpp. Is this enough for your application? A higher output level is not possible with the OPA172.

    If you need a higher output level, then you must choose a headphone amplifier.

    Kai
  • In reply to kai klaas69:

    Hi Kai,
    I still need your help for me to find the amplifier direction.
    According to your calculation result and our product have BOM cost limited
    1. what is the parameter of 6.28 ? where can look up the value of OPA172? (Xc=1/(6.28*2.2uF*1kHz)= 72 ohms.)
    2. If the design SPEC need 2Vp-p@32 ohm, operation voltage only can supply +5V, how can we find the suitable amplifier P/N? By what kind of parameter of TI selection guide?

    Thank you very much.

    Vader
  • In reply to Vader chen:

    Hi Kai,
    To correct SPEC is 2Vrms@32ohm.

    Vader
  • In reply to Vader chen:

    Hi Vader,

    Your topic was starting to separate from the original post so I split your question into its own thread. It would be helpful if you could provide a clear post detailing your questions. What are your design goals and specifications?

    Thank you,
    Paul

  • In reply to Paul Goedeke:

    Hi Vader,

    I hope that you have found your questions suitably answered. If you have no further questions, please click the Green "Resolved" button and we will close the thread.

    Thanks!
    Paul

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