Thread: Help with this Power Supply!!

please help me!!

I'm powering this PS with a normal AC-DC PS to test it. with the +12@9A output.

I did what you told me. It doesn't work. when I connect it, the AC-DC Power supply shut down.

please HELP!!!!

i think you are pushing too much current. the webpage lists the input at 3a@10V max. it has a peak current capacity of 15A @ 10V. i think you are overloading the converter. i also think the OV might be something to do with the overvoltage protection circuit that is built into this converter.

i could just be talking nonsense, since im pretty far from an electronics whiz.

i would try 12v to the 15v pin
and ground the E pin.
leaving the OV pin open.

but i would also have a fire extinguisher near by!!!

thinking back to basic electronics i took in college, couldnt you bypass some of the current around the dc-dc by shorting the 15v and E pins with a resistor. hmm, BETTER NOT TRY THAT without someone elses advice.

anyway, this was pretty much pointless. hope you figure it out.


~Mike

Originally posted by mp3z24
i
i would try 12v to the 15v pin
and ground the E pin.
leaving the OV pin open.

but i would also have a fire extinguisher near by!!!

I already did that and nothing.

alright, i thought about it a little more and i think the 0V is an overvoltage dump.... if there it too much power flowing into the dc-dc and it trips, the power has to go somewhere... wouldnt ground be the best option. would this make your ac-dc trip also, i dont know. i still stand by my guess that you are pushing too much current into the dc-dc. i bet if u can drop the current down to a couple amps, then it might work.

~mike

Now its working. I change the ac-dc PS and works fine.

Now I just need to get the -5V.

Thanks for your help.

Originally posted by mp3z24
i still stand by my guess that you are pushing too much current into the dc-dc. i bet if u can drop the current down to a couple amps, then it might work.

You don't push current into something, something draws current. The current drawn depends on the voltage you feed it and the effective resistance of the device.

Some (most??) PC power supplies require reasonably balanced loads on their outputs, with the expectation that the heaviest load will be on the 5v line (check the current ratings on the power supply, chances are that the 5v line is well above the 12v line).

Given that most PC SMPSUs run with a single switching transfomer for all the voltages (with different tappings to get you different volatges), when you draw that much current on the 12v line (especially the surge current at startup), the trip is likely to kick on the overvoltage protection on the 5v output of the PC power supply.

That would be my guess.


Rob