dc-dc converter with output as ATX?

[Aamir_Sheikh]

I am trying to make a dc-dc converter with its output in the form of standard atx i.e 12, 5, 3.3, -12, -5
so far i am thinking of using a buck regulator with along with a micro controller for PWM channels and its adc for feed back correction. input for now is fixed at 24 volts.

things I cant decide are

1) would it be better to use buck regulator ICs instead of mc, (i was told that it would be better, but how i am going to do remote sensing of 3.3v and 5v standby with them)?

2) which mosfet should i use for switching, (does the highest frequency of switching depends upon the driver)?

3) how much wattage is feasible, and consequently how much current should be available on different rails?



i have a couple more question, but i'll ask them once the thread picks up

 

[amayilsamy]

What is your input voltage & output voltage and current....

 

[Aamir_Sheikh]

input is fixed at 24 volts, output is standard atx supply, i.e 12, 5, 3.3, -12, -5.

 

[amayilsamy]

http://www.formfactors.org/developer\specs\ATX_ATX12V_PS_1_1.pdf

 

[BradtheRad]

To obtain your negative supplies, it is feasible to use buck-boost converters.

Or, consider using an H-bridge and transformer (center tap) to produce your bipolar supplies. Can't say whether it will reduce your parts count and labor.

 

[Aamir_Sheikh]

thanks for replying BradtheRad, i am going to use h bridge, i have to keep the area of my design small.