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Chassis Power Subsystem
3.2.7
730-W Power Supply Control and Indicator Functions
3.2.7.1
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 +12V power rail. When this signal is not pulled low by the system, or left open,
the output (except the +5VSB) turns off. This signal is pulled to a standby voltage by a pull-up
resistor internal to the power supply.
3.2.7.2
PWOK Output Signal
PWOK is a power OK signal and is pulled HIGH by the power supply to indicate that all the
outputs are within the regulation limits of the power supply. When any output voltage falls below
regulation limits or when AC power has been removed for a time sufficiently long so that power
supply operation is no longer guaranteed, PWOK is de-asserted to a LOW state.
3.2.7.3
PSKILL Signal Requirements
The purpose of the PSKill pin is to allow for 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.
3.2.8
730-W Mean Time Between Failure (MTBF)
The power supply shall have a minimum MTBF at continuous operation of 100,000 hours at
100% load and 45°C, as calculated by Bellcore RPP, or 250,000 hours demonstrated at 100%
load and 45°C.
3.2.9
Redundant (1+1) Hot Swap Mode
In the redundant (1+1) parallel configuration (two power supply modules installed) the +12V
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, a
failed supply may be removed and replaced with a good power supply. Hot swap works with
operational as well as 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.
3.3
730-W Power Distribution Board
The power distribution board (PDB) is designed to plug directly to the output connector of the
power supplies and contains the DC/DC power converters required to produce the output
voltages: +3.3 VDC, +5 VDC and –12 VDC along with additional protection circuitry and a FRU
EEPROM.
38
Intel® Server Chassis SC5300 5U Kit TPS
Revision 1.31
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