Hello,
I have a project that connect to all kind of devices\sensors , and my power suplly is 12V 10A .
I want to build for it a 1 Power IC so it wil be easy to work with.
can someone help me with this? the right IC and circuit I need ?
I look in google and all I have found is 3.3V or 5V or 9V

Thanks ,

 

LM2596 pcbs ready made..

 

this is what I'm using right now ,
but it's only up tp 3A
and I'm using 2 of them (1 for 5V and 1 for 3.3V)
maybe there is a chip that I can setup it to 2 outputs, or one that can work up to 6-7A , then I will take the output and devide it according the R1\R2?
if not I will use 2 for 5V 4A ( because its for 2 devices anyway) , and 1 for 3.3V 2A

if i take the exampke you send
LM2596 Adjustable Output Voltage Regulator

I need to use
R2 = 1.68K for 3.3V output
R2 = 3.06K for 5V output?
right?



Thanks ,

 

Use a preset 2K2 preset and 1K resistor to get it exact.


There are others on Ebay with higher outputs...

https://www.ebay.co.uk/itm/5A-DC-DC...stant-Current-Voltage-Regulator-/282771068205

 

sorry but I don't understand what you mean

Use a preset 2K2 preset and 1K resistor to get it exact.

what is preset 2k2?
it won't give me 3.3 or 5V at the output
I don't see which chip they are using to get 5A

in the end I will need to make this circuit in my PCB ,and not addon this is why I need to get all he information

Thanks ,

 

The Voltage output is set by the two resistors on the feedback pin, so if you use a 2K2 preset resistor and a 1K fixed resistor in series, you can adjust the output to your desired voltage exactly.

So for 3.3V, use a 1K for R1 and the 2K2 preset for R2, for 5V put the extra 1K in series. ..

 

ohhhh ,you mean potentiometer .....
yes this is a good thinking

can you see the chip name for the 5A ?
is it xl4015?

 

If you are not stuck with that PS, I would consider an ATX supply.
All three voltages available
3.3
5
12

 

it will be ideal but I can't ,
must use this power suplly

 

ohhhh ,you mean potentiometer .....
yes this is a good thinking

can you see the chip name for the 5A ?
is it xl4015?

Yes datasheet here, there are ready made modules on Ebay...


https://www.google.com/url?sa=t&sou...Vaw1NM_Loy17g9XtIvghR2Vt2&cshid=1583940802251

 

ok
I have a question about the datasheet :
there are 2 Typical System Application 5V\5A and 12V\4A
where do you "limit" the output current?
because the circuit is the same for both application (except R1 and R2 - which give the 12V ot 5V )?

Thanks ,

 

The only way is to use an op amp or Transistor and series shunt resistor, or use a different chip with current limit built in.

 

I don't want to limit,
if it can give me up to 5A - it's great!

I want to understand why in the second example the output current is 4A , that all
Thanks ,

 

It's comparing the Efficiency, lower output current is better Efficiency, they will both deliver 5Amps,..