ATX PS Spec Question - Electronic Circuits Projects Diagrams Free

savage · 20th April 2006, 02:38 PM

Hi,

I got the ATX PS specs at formfactors.org, hopefully wanting to use these power supplies and implement them properly into projects of mine.

The spec indicates that there are 2 x +12V Rails supplied. +12V1 and +12V2. The 20/22 pin ATX connector only features the +12V1 Rail, and they do not indicate whether +12V1 or +12V2 are used in the other output connectors (HDD, Floppy, SATA, etc connectors).

Does anyone know where the second +12V Rail (+12V2) is going to ? Either I'm blind, or the second rail is not used anywhere at any of the outputs of the power supply...

The spec also indicates that a maximum of 11.5A is posible on the +12V2 Rail at maximum load (250W), or even better 14A on +12V2 at 400W. These are a bit high for me... Does anyone have practical experience here? Witnessed it before? I'll be rather astonished if these Power Supplies are actually capable of delivery such a high load when required...

Thanks,
Chris.

savage · 20th April 2006, 03:05 PM

Second Rail on the Aux Power Connector

I was blind.

Thanks anyways.

Sebi · 20th April 2006, 08:18 PM

The PC PSU without 5V loading not work properly.If You need full power from 12V out, need a hard modification.

savage · 20th April 2006, 08:30 PM

Yeah, I know it needs a load on the 5V Rail. I'll be using 3.3, 5 and 12.

Thanks

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20th April 2006, 02:38 PM	#1
savage	ATX PS Spec Question Hi, I got the ATX PS specs at formfactors.org, hopefully wanting to use these power supplies and implement them properly into projects of mine. The spec indicates that there are 2 x +12V Rails supplied. +12V1 and +12V2. The 20/22 pin ATX connector only features the +12V1 Rail, and they do not indicate whether +12V1 or +12V2 are used in the other output connectors (HDD, Floppy, SATA, etc connectors). Does anyone know where the second +12V Rail (+12V2) is going to ? Either I'm blind, or the second rail is not used anywhere at any of the outputs of the power supply... The spec also indicates that a maximum of 11.5A is posible on the +12V2 Rail at maximum load (250W), or even better 14A on +12V2 at 400W. These are a bit high for me... Does anyone have practical experience here? Witnessed it before? I'll be rather astonished if these Power Supplies are actually capable of delivery such a high load when required... Thanks, Chris. __________________ Regards, Chris.

20th April 2006, 03:05 PM	#2
savage	Second Rail on the Aux Power Connector I was blind. Thanks anyways. __________________ Regards, Chris.

20th April 2006, 08:18 PM	#3
Sebi	The PC PSU without 5V loading not work properly.If You need full power from 12V out, need a hard modification.

20th April 2006, 08:30 PM	#4
savage	Yeah, I know it needs a load on the 5V Rail. I'll be using 3.3, 5 and 12. Thanks __________________ Regards, Chris.