A SMPS 5V regulator wanted

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A SMPS 5V regulator wanted

Postby Herath » Sat Aug 13, 2011 7:19 pm

Does anyone know of any 5V SMPS regulator circuit?. It should be fairly easy to build and should be at least about 70% (or more) efficient.
The reason I am looking for one is that I think a 7805 regulator will waste lots of energy if i use it with a 12V input.
Thanks
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Re: A SMPS 5V regulator wanted

Postby Rksk » Sun Aug 14, 2011 3:09 am

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Re: A SMPS 5V regulator wanted

Postby Herath » Sun Aug 14, 2011 5:23 am

I basically looking for a modern DC/DC voltage regulator chip. I want to build a portable charging station/power supply for using when I am away from the for more than a day.
Linear voltage regulators do their work by wasting excess power as heat. I do not want to waste energy, when I am away every watt counts. :D . On the other hand, wasting energy is sin.  :mrgreen:

Those chargers that you can buy for LKR150 does not even have a linear voltage regulator. The voltage drops when the power draw is high. That's why i need a regulator to stabilize.
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Re: A SMPS 5V regulator wanted

Postby Rksk » Sun Aug 14, 2011 6:20 am

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Re: A SMPS 5V regulator wanted

Postby Neo » Sun Aug 14, 2011 1:36 pm

Attachments
LM2596.PNG
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mc34063.gif
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MAX638.gif
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Re: A SMPS 5V regulator wanted

Postby Herath » Sun Aug 14, 2011 3:25 pm

Thanks neo. I will try to find the components for one of these. I found some on the Internet, but the components in most of those designs were hard to find.
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Re: A SMPS 5V regulator wanted

Postby SemiconductorCat » Mon Aug 22, 2011 8:10 pm

the simplest way to build a SMPS is how neo told. But read fully the chips docs before you buy it.
However if you are using ripple devices like servo motors driectly drawin current from it then
that single chip poor man's quick and dirty home-made SMP won't work either.

Then I suggest to use AT power supply. Search on the internet how to get power from
AT power supply.

Just curious,For what you need 5V power supply? Are you going to weld with it? (btw at least you need
48Volts to get a proper welding spark,still the gap will be too small). Then you can use 3 car battries for
that. warning and caution , a mistake with car battries will burnt your face or resultant magnetic field
will suck your blood iron out of ya body  :evil:
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Re: A SMPS 5V regulator wanted

Postby Herath » Mon Aug 22, 2011 8:14 pm

No, not for welding. :D
I want a one to built a portable power source, for charging stuff etc. I hope to employ a battery at input and a USB female port at the other end. So I can use it to charge devices and run electronics. I am also thinking about a good battery. A reasonably capable one. About 7Ah may be. :D

The reason I am considering a SMPS is that I do not want to waste the juice on the battery.
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Re: A SMPS 5V regulator wanted

Postby Neo » Sat Sep 17, 2011 2:36 am

Herath,

There is an adjustable version of all these LM series SMPSs which marked with 'ADJ' instead of voltage.

3.3 V fixed version
fixed.jpg
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Adjustable (ADJ) version
adj.jpg
adj.jpg (6.34 KiB) Viewed 7867 times


Circuit Diagram
ADJ_cd.PNG
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Placing resistors
res.PNG
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Components
comp.PNG
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Re: A SMPS 5V regulator wanted

Postby SemiconductorCat » Thu Sep 29, 2011 11:46 am

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