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Need helps for supply power design with MOS-FET transistor!

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digitalheart

digitalheart

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Re: Need helps for supply power design with MOS-FET transist

I want to design a switching supply power which uses only 1 MOS-FET transistor. I used to design some switching supply powers before but used 2 BJT transistors, like a ATX supply power for computer but with only +5V output. I don't know how to start with design uses MOS-FET Transistor.
So anyone has any idea about this design, please show me the way to help me finishing this task. A shematic for this type of supply power is better!
(I have got a ATX 200W supply power for computer. So If anyone needs, i'll send to).
Best regards!

Added after 10 minutes:

Oh! Sorry, I want to say that I have got a shematic about it!
 


Re: Need helps for supply power design with MOS-FET transist

IanP said:
Here are links to sites on smps based on single MOSFET:
h**p://www.onsemi.com/pub/Collateral/AND8039-D.PDF
h**p://www.onsemi.com/pub/Collateral/SMPSRM-D.PDF
and as a reference, if you would like to rewind the HF transformere example of transformer calculations:
h**p://www.fairchildsemi.com/an/AN/AN-4102.pdf
Click to expand...

Thanks for your help!
Could I have more some questions? Because i want to design standard power supply module, I learned some theory about load sharing when the supply powers are in parallel. But i don't know infact how it is executed. I have made some tests but not success. Can you help me once more?
 

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