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Power supply using dc to dc converter circuit or any other circuit

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garostoss

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hy i want to create a dc-dc converter circuit that will be able to convert 30v/2a into 12v/5a dont seem to have a clue on what to do tried using lm317 with transistors in parallel im only able to adjust the voltage not the current,
 

Hi,

30V, 2A = 60W
12V, 5A = 60W

This means "no loss" = 100% efficiency. This is not possible.
Please give an efficiency value that is acceptable by you. Useful values are 80%, 85%... even higher becomes difficult and needs extra effort.

***
Generally this calls for a "switch mode voltage converter".
Becasue input voltage is higher than output voltage: look for "buck" or "step down" converters.

There are ready to buy ones. With or without isoation.
And there are ICs, so you can design them on your own.
Go to a distributor like this: https://www.newark.com/w/c/semicond...wer-management/prl/results?st=buck+controller

There you may select the device you need. You get an overview about manufacturers, price, availability...

But additionally you need to go to the manunfacturer (of your choice) and look for latest datasheets and application notes.

Klaus
 

dc-dc converter circuit that will be able to convert 30v/2a into 12v/5a

Theoretically a buck converter can do this. This simple simulation is based on using ideal components.

buck conv clk-driven 30V 2A to 12V 5A LC input filter smooths.png

The LC input filter draws smooth current from the supply. Internally the converter has waveforms peaking over 8A. The capacitors must carry several Amperes going back and forth at several kHz. For the switch you'll use a transistor or mosfet.
 

here i give simulation of buck for 60v to 12v at 5a.
just download the free ltspice simulator from linear.com

Then load it then hit run

i attach quik start guide too.

convert the .txt file to .asc file first, or else ltspice cant use it.
(this forum will not allow to post .asc files directly.)
 

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  • LTspice _Quick Start Guide.doc
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