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12V-5V converter

Discussion in 'General Electronics Discussion' started by Atharva Bagde, Aug 27, 2017.

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  1. Atharva Bagde

    Atharva Bagde

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    Aug 27, 2017
    hey guyz
    i am relatively new to electronics and need ur help for making a 12v-5v voltage converter with 3A output preferably without heat sink
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    look for buck converters on eBay ... .there's dozens of them
     
  3. Atharva Bagde

    Atharva Bagde

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    0
    Aug 27, 2017
    actually i wanted to make a circuit of my own
    can u suggest me a circuit with MC34063A or using
    LM317T
     
  4. Bluejets

    Bluejets

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    824
    Oct 5, 2014
    Heaps of circuits out there for 317 with pass transistor for higher current.
    Don't know if you'll get away without a heatsink though.
     
  5. kellys_eye

    kellys_eye

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    1,146
    Jun 25, 2010
    Dropping 7V at 3A will dissipate 21 watts in an LM317 circuit so that pretty much rules it out if heatsinking is a particular issue to be avoided.

    An SMPS is perhaps the only way to go but even then it will be of the order 80-90% efficient so perhaps 2W to dissipate, perhaps less if you are careful in the design. This could be handled by some TO220 packed devices without heatsinking (maybe a little copper on the pcb to assist?) but I don't know what you're prepared to do with the actual construction.

    There are too many devices available to make a specific recommendation but use a site like alldatasheet.com and enter buck converter as a search parameter to list devices that could be chosen from.
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    I told you what option to use
    any other way will require significant heatsinking
     
  7. BobK

    BobK

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    Jan 5, 2010
    In a buck converter, the heat is dissipated in multiple components, not just a single pass transistor, so it is easier to manage. 3A without a heat sink should be quite doable.

    Bob
     
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