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LM2596 inductor, capacitor, diode

Discussion in 'General Electronics Discussion' started by holex, Jun 2, 2014.

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  1. holex

    holex

    21
    0
    Jun 2, 2014
    Hi,
    I have an LM2596 5.0, and I would like te build a power supply for an AVR (+LCD+sensors, etc..) and a servo motor (MG946R), so I need 3A and 5V. The input voltage 35V. What capacitor, inductor and diode I need? I can't understand the datasheet... What else should I need pay attention when buying the parts? For example I heard, that I need a closed core inductor.

    Thank you!
     
  2. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Hi and welcome to electronicspoint !

    You can use the TI friendly webench tool, see here under, for all the parts calculations

    http://www.ti.com/product/lm2596

    You must create and account to do that. The tool allow components tuning to match your sources or footprints needs.
    Closed inductor (toiroid) are better as the fields are confined, giving less impact on surrounding parts.
    This is not mandatory but just an asset. The routing is not that sensitive, i suggest to start from the datasheet layout.

    My two cent to make your life easier is to buy an hard to beat LM2596 board from ebay

    http://www.ebay.com/sch/i.html?_sacat=0&_from=R40&_nkw=lm2596&_sop=15

    Olivier
     
  3. holex

    holex

    21
    0
    Jun 2, 2014
    Thank you very much for your help, but webench can't calculate with through-hole parts, only with SMDs :(
     
  4. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    The component mounting method don't impact the design that much. You can also create customs parts by entering the main characteristics according to the parts you intend to use.
    Olivier
     
  5. holex

    holex

    21
    0
    Jun 2, 2014
  6. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Last edited by a moderator: Jun 11, 2014
  7. holex

    holex

    21
    0
    Jun 2, 2014
    Yes, I used, and due to simulator these components are good, but somebody said me that the inductor is too big... So I dont know whom to believe.
     
  8. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    If you have room enough you can go for a big inductor, the will offer a lower Rdc what is a good think!
     
  9. holex

    holex

    21
    0
    Jun 2, 2014
    Ok, thank you! And isn't it problem, that the inductor is not shielded?
     
  10. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Not a problem at all!
     
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