LM2575-5 help

Discussion in 'General Electronics Chat' started by Garurumon, Nov 26, 2013.

  1. Garurumon

    Thread Starter Member

    Mar 17, 2013
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    I'm building a little 5v breadboard supply, and I bought LM2575-5 switcher.

    However, I read somewhere that it won't operate very well on very low currents? Is that true? If yes, could that be fixed by adding a minimum load?

    Is this 52kHz switcher good (stable, low ripple) enough for powering micro controllers and digital stuff anyway?
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
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    I don't see anything in the data sheet about minimum load, but 5 or 10 ma. might not hurt. Seems you could run a lot of logic with an amp.
     
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  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    It will have no problem at light load or no load. It may be dropping pulses so you might hear some noise. may be a shade higher output voltage ripple at no load, but will regulate properly.
     
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  4. takao21203

    Distinguished Member

    Apr 28, 2012
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    Add a LED (can be low current).

    uC will often need additional filtering coil. But you don't need additional large capacitors, 1uF or so will do.
     
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  5. Garurumon

    Thread Starter Member

    Mar 17, 2013
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    Thanks to all of you...

    One more question, how is the ON/OFF pin (pin 5) used? Can I put a switch there to controll it?
     
  6. Metalmann

    Active Member

    Dec 8, 2012
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  7. Garurumon

    Thread Starter Member

    Mar 17, 2013
    99
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    Metalmann likes this.
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