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Decoupling capacitors

Discussion in 'General Electronics Discussion' started by CommanderLake, Jan 15, 2015.

  1. CommanderLake

    CommanderLake

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    Oct 2, 2012
    Can I use a 10µF ceramic instead of a 10µF electrolytic and 0.1µF film with an LM3886 to save space?
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    you need the 0.1uF
    it isn't the same as a 10uF ;)
    not sure what you are referring to as a 10uF ceramic ? I have never seen a 10uF ceramic

    Dave
     
  3. CommanderLake

    CommanderLake

    193
    6
    Oct 2, 2012
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    I would always use what the data sheet recommends, unless I thought I knew more than the authors of the data sheet!
     
  5. CommanderLake

    CommanderLake

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    Oct 2, 2012
    I've just tested the volt drop of various electrolytics, film and ceramic capacitors with my USB oscilloscope, a 3.8v battery source and a 10 ohm load and the results are as follows:

    With no capacitor there are wild peaks and dips when the load is applied.

    Aluminium electrolytics remove noise and wild peaks and drops when the load is applied but dont slow the immediate volt drop.

    Film and ceramic eliminate the sudden volt drop and smooth it to a gentle slope, smaller values dip slightly before stabilizing.

    A larger aluminium electrolytic along side a smaller film capacitor doesnt do much at all, if anything its more stable without the electrolytic.
     
    Last edited: Jan 15, 2015
  6. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I use 10uF ceramics as standard PDS support on most of my designs now. I even use some 100uF ceramics for certain applications. For the 100uF I limit the working voltage to about 6.3V, otherwise they get very expensive.

    Adam
     
    KrisBlueNZ likes this.
  7. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
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