"picopsu" type dc-dc board with a PS3 PSU

[nismoguy82]

I posted this on another forum but got no response. I hope you guys can offer some insight.

What do you guys think about a Picopsu type dc-dc board powered with a PSU from a phat PS3? I know that the PS3's psu can be converted into a 12v bench supply like ATX psu's. I figured it would work since the dc-dc board just needs a 12v input. The only thing I'm not sure about is if the psu would be able to go to sleep/standby correctly like a ATX psu would.

I found this:

from this thread:
http://www.ps3hax.net/showthread.php?t=39893

From that thread, it seems the "On" line is the same as the PS_On wire on an ATX connector. Also, that's the wire that needs to be jumped to the last 5v line to act as "power good" for it to be used as a bench supply.

I opened my PS3 psu and looked at the bottom side of the pcb under the 5 pin connector and they're labeled as: 12v on/off/ 5vsb rtn/ 5vsb rtn/ 5vsb/ 5vsb..

I know I can just run the PS3 psu as a bench psu and wire the main 12v to the dc-dc board, but I still want the standby mode functionality of an ATX psu. Or, be able to turn the PSU on/off through the OS. Thoughts?

Did some digging, the ON wire is 3.3vrtn. Is it possible to just wire the PS3 straight up to a 24pin ATX connector?

I'm asking because I'm trying to squeeze a gpu into a Silverstone ML06/5 case. My first 2 options were: dc-dc board with PS3 psu, or a 1U psu. I might have a 3rd option if it's possible to use the PS3 psu without the dc-dc board.

 

[Pinhedd]

I posted this on another forum but got no response. I hope you guys can offer some insight.

What do you guys think about a Picopsu type dc-dc board powered with a PSU from a phat PS3? I know that the PS3's psu can be converted into a 12v bench supply like ATX psu's. I figured it would work since the dc-dc board just needs a 12v input. The only thing I'm not sure about is if the psu would be able to go to sleep/standby correctly like a ATX psu would.

I found this:

from this thread:
http://www.ps3hax.net/showthread.php?t=39893

From that thread, it seems the "On" line is the same as the PS_On wire on an ATX connector. Also, that's the wire that needs to be jumped to the last 5v line to act as "power good" for it to be used as a bench supply.

I opened my PS3 psu and looked at the bottom side of the pcb under the 5 pin connector and they're labeled as: 12v on/off/ 5vsb rtn/ 5vsb rtn/ 5vsb/ 5vsb..

I know I can just run the PS3 psu as a bench psu and wire the main 12v to the dc-dc board, but I still want the standby mode functionality of an ATX psu. Or, be able to turn the PSU on/off through the OS. Thoughts?

+5v = 5 volt high current main supply

+5vsb = 5 volt low current standby supply.

The +5vsb lines will be powered even when the supply is off. The purpose is to power the circuitry which drives the POWER_ON signal. Typically the POWER_ON signal is weakly driven high by the PSU and must be pulled low through a low impedance path to ground to start the PSU.

 

[nismoguy82]

so, is that a, "no it's not possible"? sorry, I'm getting foggy at the moment, need to hit the sack.

I'm thinking that the PS3 5vsb can be wired to the purple 5vsb on the ATX connector, and the 3.3vrtn/ON wired to the PS-ON at the ATX....?

 

[Pinhedd]

so, is that a, "no it's not possible"? sorry, I'm getting foggy at the moment, need to hit the sack.

I'm thinking that the PS3 5vsb can be wired to the purple 5vsb on the ATX connector, and the 3.3vrtn/ON wired to the PS-ON at the ATX....?

Um, careful with that.

There's no reason to short the 5Vsb wires together.

I would advise against wiring the PWR_ON together without testing the potential first. ATX specifies that it be driven to +5v but I have no idea for the 12v to 5v step down board. Intuition tells me that they'd use one single buck converter to drive the +5v, +5vsb, and PWR_ON outputs so I would assume 5v but you should check first.