Hi all,

I'm in the initial stages of designing an ATX power
supply for my car. ATX power supplies put out
12V,5V,3.3V on a 20 pin standard ATX connector. There
is a complexity in that the supply is expected to
intially generate a 5V power-good signal and then only
start full-operation when a power-on input signal is
delivered from the PC's pushbutton or some other input
source. I've got a regulated 12-Volt DC supply coming
from the cigarette lighter. What I've got to design is
a 12VDC to ATX supply. I checked out a couple of car
accessory shops and found that some designs do exist
and are actually quite nice. One was only 5" by 2".
But I'd rather enjoy the experience of designing one
from scratch. I noticed that most of the DC-DC ATX
boards have a single chip on them that I suspect
handles the power-good and power-on signaling as well.
The weird thing is that this chip has no label, it's a
matte black leading me to suspect that it's either
been painted over or sandpapered. Anyone know anything
about this chip or suggestions on how to go about
designing an ATX supply?

Thanks,
Roines




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