I got a buck converter for led lights but i believe it doesn't support high amps. LM2596s. What would be the highest amp for this buck converter, i couldnt figure it out from datasheet.
Also are there any buck converters suitable for this purpose other than using a 7805 circuit?
What does your data sheet for the device tell you? mine says 3 amps if you use the circuit shown on the data sheet.
I don't know if there are any 200W chips. I'd sort-of assume it's going to take additional circuitry (maybe a "high power" MOSFET)...
You're lucky to get 1A out of a 7805. 
They are rated for 1A but it depends on the voltage you're "dropping" and going from 12 to 5V generates 7 Watts of heat and it requires some "serious" heat sinking.
Hi, @nervusvagus
Can you post a link to where you purchased the LM2596 if you bought it as an assembled module?
Thanks.. Tom... 
I live in Russia and its mostly modules here
Can you post a link to where you purchased or saw the module please?
Tom...
You clearly want a proper switchmode mains power supply, not a "buck" converter.
But 200W at 5 V is 40 Amps. Whatever do you propose to use that requires 200W - 40 A - of LEDs? Surely not your child's swing! 
Or are you mistaking this for merely using that module to power the Arduino only from a 12 V LED power supply, which is no problem at all.
I need to power arduino mega over long distance (7 meters, 22 feet) using a 5v 20amp power supply.
I was aware that 5v pin was my only option since vin requires 7 volts or more. However below it is mentioned that USB of arduino mega is also an option. I needed to be sure, Is this advised, to cut a usb cable and plug it into mega to power it?
What else needs to be powered.
Running 5v @ 22 feet is a bad idea 
Why can you not run AC 22 feet ?
About 20 meters of ws2812b leds needs to be powered.
Arduino is located on the seat of a children's swing with an accelerometer and leds attached.
Hi @nervusvagus ,
In 22 feet of copper wire (18AWG), there is a resistance of 0.14Ω.
Lets call the power consumption of the Mega @ 100mA.
To find the voltage drop, some quick math:
V = IR
V = 0.1*0.14
V = 0.014
Over 22 feet, the copper wire powering the Mega will have a voltage drop of 14mV (@ ~25˚C).
So the Mega will only get 4.986V. For 100mA, this is fine, but if you are powering anything else from it, the voltage drop will quickly increase.
Cutting a USB cable vs. powering it from the +5v pin doesn't really matter. Either will work.
Hope this helps!
That doesn't tell us much.
There are strips with different density, so the number of LEDs is far more important.
But that's a huge difference in current draw with all LEDs being on or off.
A 12volt supply, and a 12>5volt buck converter on the Arduino side could be a better solution.
Why a Mega.
Leo..
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Boy, is this ever confusing! 
Multiple different threads about what I gather still has to do with a child's swing.
Could the OP please give a detailed description of what he is actually trying to construct, its purpose, and how he proposes to power it. 
Two unrelated topics were merged for some reason, one was if its better to power arduino through usb, the other was buck converters and amps.
Attached is a video of what im trying to do. The movement and the need for compactness requires as less cable as possible and adds challenges.
The reason would be that as best we can determine, they are actually parts of the same project, and that in order to answer each "separate" problem adequately, it is simply essential to have a complete description of all parts that need to work together.
It is unlikely - particularly given the difficulty obtaining such a complete description in just one thread, that each separate thread might contain the full description.
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