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MC34063A: Symetrical power rail from +24DC

Quentin
Prodigy 60 points
Part Number: MC34063A
Other Parts Discussed in Thread: PMP10091

Tool/software:

Hi,

I am designing a small HiFi equipment and need a symetrical +/-18VDC for the system. The power requirment does not exceed 100mA.
I initally thought to power the equipment using off the shelve 24VDC wall adaptor and invert voltage to -24VDC then run it through linear regulator to get rid of any noise and ripple but to my surprise I couldn't find any affordable component that would take Vin 24V and output to -24VDC.

I'm not experienced in power management but I thought that would be a common need for several designs...
Do you have any IC recommendation or maybe a different approach to get symetrical 18V power rail ?

Thank you.

  • 0
    TI__Guru 65340 points

    Hello Quentin,

    You could have a look at this design. It creates more output power than what you need, but could be a good starting point: PMP10091 reference design | TI.com

    For this design you  would need a lower input voltage.

    MC34063A will do the job as well.

    Other devices might be some buck controllers as well.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 60 points

    Hello Brigitte and thank you for your support.

    Allow me to dig into the reference design you've shared and come back to you with question if any.
    Thank you very much.

  • 0 in reply to Brigitte
    Prodigy 60 points

    Hi Brigitte,

    I've checked the PMP10091 reference design you shared and made several simulations using WeBench PowerDesigner, which helped me come up with the following design.

    Since I'm not very experienced with this type of design, would you mind taking a quick look to see if it appears reasonable?

    Thank you for your help.

  • +1 in reply to Quentin
    TI__Guru 65340 points

    Hello Quentin,

    Looks good for me. As best practice, I would add the capability to turn off the IC via a resistor on DIS/EN to VDD, but it is not necessary.

    In addition, I would add a relatively big resistor in series to C101 just in case it is needed due to high current spikes. As well not really needed.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 60 points

    Hello Brigitte,

    Thank you very much for the feedbacks!
    I'll proceed with prototyping.
    Best regards.