Technical Product Specification

Intel® Server Chassis SC5600 Chassis Power Subsystem

Revision 1.1

Intel order number E39532-004

5.2.7 750-W Power Supply Control and Indicator Functions

5.2.7.1 PSON

Input Signal

The PSON

signal is required to turn on/off the power supply. PSON

is an active low signal that

turns on the +12 V power rail. When this signal is not pulled low by the system or left open, the

output (except the +5 VSB) turns off. This signal is pulled to a standby voltage by a pull-up

resistor internal to the power supply.

5.2.7.2 PWOK (Power OK) Output Signal

PWOK is a power OK signal that is pulled HIGH by the power supply to indicate all outputs are

within the regulation limits of the power supply. When any output voltage falls below regulation

limits or when AC power is removed for a time sufficiently long so that power supply operation is

no longer guaranteed, PWOK is de-asserted to a LOW state.

5.2.7.3 PSKILL Signal Requirements

The purpose of the PSKill pin is to allow for the hot-swapping of the power supply. The PSKill

pin on the power supply is shorter than the other signal pins. When a power supply is operating

in parallel with other power supplies and then extracted from the system, the PSKill pin will

quickly turn off the power supply and prevent arching of the DC output contacts.

5.2.8 750-W Mean Time Between Failure (MTBF)

The power supply shall have a minimum MTBF at continuous operation of 100,000 hours at

75% load and 40° C, as calculated by Bell core RPP, or 250,000 hours demonstrated at 75%

load and 40° C.

5.2.9 750-W Redundant (1+1) Hot-swap Mode

In the redundant (1+1) parallel configuration (two power supply modules installed), the +12 V

output shared output current is enough current to meet voltage regulation limits during hot-

swapping and power supply failures. Hot-swapping a power supply is the process of inserting

and extracting a power supply from an operating power system while the AC cord is unplugged.

During this process, the output voltages shall remain within the limits specified. In general, you

can remove a failed supply and replace it with a good power supply. Hot-swap works with

operational and failed power supplies. There is a mechanical latch on the power supply to

prevent the removal or insertion of a power supply while the AC power cord is plugged into the

power supply.