hacking atx power supply

[justin66]

hey guys i would like to figure out a way to hack the atx power supply with a controller sg6105dz. i have tried a few logical ways to hack it but i didnt succeed yet
i have tried installing voltage dividers on to the pin that directly sense it does not change the output voltage. so any suggestions on how do i hack it?
i cant really understand how this chip works unfortunately

datasheet http://www.sg.com.tw/semigp/data/6105/6105-datasheet.pdf

[madires]

Get an ATX PSU with a SMPSU controller at the primary side. It seems that you can't modify the sg6105dz based circuit.

[station240]

Ugh, it has a voltage sense input for each rail, so you'd need to trick those inputs as well.

You'd be better off with a PSU with a more conventional PWM controller, for instance a TL494.
Those ICs are dirt cheap and commonly available if you wanted to retrofit the PSU you have to use that instead.

[justin66]

so i need to install 3 voltage deviders on those sense lines labeled v33 v5 v12
is it possible to add an other chip or something like that? i have ka7500b chip witch is also from switching psu. is it possible to change it out ? for my project i need 14v output. i just really need this done with this psu. thanks in advance