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12V-5V converter

Atharva Bagde

Aug 27, 2017
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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
 

davenn

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Sep 5, 2009
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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

look for buck converters on eBay ... .there's dozens of them
 

Bluejets

Oct 5, 2014
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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.
 

kellys_eye

Jun 25, 2010
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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.
 

davenn

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actually i wanted to make a circuit of my own
can u suggest me a circuit with MC34063A or using
LM317T

I told you what option to use
any other way will require significant heatsinking
 

BobK

Jan 5, 2010
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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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