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/diy/ - Do-It-Yourself

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Anonymous 05/19/14(Mon)04:15 UTC+1 No.640164 Report

Hey /diy/

I am wanting to make a 3.3V buck converter as part of a larger circuit. Reason for this is that my current way of providing 3.3V is through a voltage regulator, and with Vin being 7.4V-11.1V, it gets rather hot and so is inefficient.

So my question is, does anyone know a good buck converter chip? Can be fixed or adjustable voltage.

Cheers
>>
Anonymous 05/19/14(Mon)04:59 UTC+1 No.640173 Report

depending on how tight your power requirements are, just attach your regulator to a heatsink.

you can get voltage regulator project boards from RC shops or buck converters off ebay for nearly a buck.

voltage regulators are inefficient because they convert electrical energy into heat in order to reduce the voltage.

7.4V-11.1V sounds like lithium 3S voltage ranges. there are premade boards meant for RC applications with weather proofing ect.
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Anonymous 05/19/14(Mon)05:12 UTC+1 No.640180 Report

>>640173
It's attached to a heat sink at the moment, just for ver2 of the board I wanted to add a buck converter. Yea, might just get a pre made buck converter from ebay and attach it to the circuit.
>>
Anonymous 05/19/14(Mon)05:56 UTC+1 No.640198 Report

What kind of circuit? What are the current ratings?
>>
Anonymous 05/19/14(Mon)06:20 UTC+1 No.640203 Report

>>640164
https://www.youtube.com/watch?v=qGp82xhybs4

eevblog shows how to make a switch mode power supply, and you are in luck he walks through how set it up as a buck converter.
>>
Anonymous 05/19/14(Mon)06:50 UTC+1 No.640219 Report

I looked at OP's picture and was first convinced it was an Egyptian city on a plateau...
>>
Anonymous 05/19/14(Mon)07:03 UTC+1 No.640226 Report

>>640164
http://www.linear.com/products/step-down_%28buck%29_regulators
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