MC34063 Buck Boost

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  • barry wilkins
    Senior Member
    • Aug 2009
    • 172

    #1

    MC34063 Buck Boost

    Hi I have trying to make a power supply to give me outputs
    Say +10 volts & -10volts from 12 volts.
    I have some MC34063 ICs so am using them ,but the circuits do not work ?
    Even the one on the application notes from thr MFR
    The osc. is working I can see that on my scope ,but the output say pin1 is wrong to me .?

    barry
  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8701
    • USA

    #2
    Re: MC34063 Buck Boost

    Dead IC? Misconnected IC?

    Have a photograph of your setup?

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31003
      • Albion

      #3
      Re: MC34063 Buck Boost

      there are chinese modules that will give you +-12v from a single supply - people use them to drive audio pre-amps.
      you could use that followed by LDO linear regulators to get it rock stable - or just mod one for +-10v

      if you make your own, remember it's high frequency.
      schottky diodes only and low esr caps or it will fail
      Last edited by stj; 03-03-2020, 11:20 AM.

      Comment

      • redwire
        Badcaps Legend
        • Dec 2010
        • 3906
        • Canada

        #4
        Re: MC34063 Buck Boost

        Look for "1W DC-DC" and you can find the smaller SIP modules. There are bigger 2-3W ones as well. They are not regulated and have a min/max load. Mornsun seems to be the low cost ones, B1212S 10.8V-13.2V in, and 8% variation with the 12V output.
        There are dual +/-12V or +/-15V modules too.
        It's just much less hassle in a project to use these instead of making one.

        Comment

        • eccerr0r
          Solder Sloth
          • Nov 2012
          • 8701
          • USA

          #5
          Re: MC34063 Buck Boost

          I found the MC34063 fairly easy to use ... though as said, part selection is critical.
          I had a small variable 1A PSU based on the MC34063 but eventually took it apart as the components I had on hand could not regulate across the whole band I wanted.

          I eventually repurposed it to a 5A converter to reduce the voltage of my solar panel, seems to work okay... used an external 2n3055 + PNP as complementary darlington pair as the switch. Not a very good switch, but works good enough.

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