Connect with us

12V-5V converter

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

Scroll to continue with content
  1. Atharva Bagde

    Atharva Bagde

    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

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

    Atharva Bagde

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


    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


    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 and enter buck converter as a search parameter to list devices that could be chosen from.
  6. davenn

    davenn Moderator

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


    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.

Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day