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TPS65130 for audio application

MikeW9894
Intellectual 540 points
Other Parts Discussed in Thread: TPS65130, TPS7A3401

Hello,

 

I'm looking for a simple way to provide a good power supply for an audio circuit.  It is USB powered and uses a 98dB SNR DAC so I'd like to stay at that range for the audio stage.  I need to generate a +15V and -15V supply and I was looking at the TPS65130/1 as a nice all in one chip.  It's stated as good for display biasing and such but I was wondering how good the output is for audio op amp control.  This will mean a lot of transient current demand and some slight input voltage change depending on the quality of the USB host port.  If I filter the output well and provide lots of capacitance to keep the ripple low, do you think I will have any issues with noise leaking into my audio stage?  Any recommendations for such a case?  I don't expect to use more than 100mA on each rail as worst case peak with normal usage under 50mA on each rail.

 

Thanks!

  • 0
    TI__Mastermind 36110 points

    The TPS65130 would be a good start.  You will just need to get an EVM and test the power supply in your application.  If you need lower noise than the TPS65130 outputs provide, you can post filter the outputs with a linear regulator.  We have two linear regulators that are ideal for this application. These parts will release in mid August.  I can't provide details yet, so build and test with just the TPS65130 and you can add linears later if necessary.

  • 0 in reply to Matthew Day
    Intellectual 540 points

    Hi Michael,

     

    I've built this circuit and it seems to perform well.  I had a bit  of  trouble finding values in the feedback circuit that provided a reliable output but once I got there it seems to be hanging on.  It's a touchy chip though based on what I've tested!

     

    I'm very interested in hearing more  about these LDO's that you think I can use on the power rails and hopefully you will look me up later or maybe send a personal message giving me some idea what part numbers I should be looking for in August.  The selection of low noise, low drop out linear regulators from TI is limited at these voltages, especially on the negative rail.  I think I only found one so far.

     

    Thanks again!

  • 0 in reply to Matthew Day
    Genius 3295 points

    I realize this was a year ago; what linear regulators were released (if any)?

     

    Thanks.

  • 0
    TI__Mastermind 41760 points

    Mike,

    I have a list of possible LDO regulators that can meet the positive and negative rails you need while providing low noise.

    Positive Rail - 7612.p_rail.xls

    Negative Rail - 3644.n_rail.xls

     

    I suggest the TPS7A3401 for your negative rail. There is also an EVM for this chip that you can use to test it out with your system.

     

    Regards,

    Darwin

      

  • 0 in reply to Darwin Fernandez
    Genius 3295 points

    Thanks very much Darwin!

     

    Mike T.