Technical Product Specification
Chassis Power Subsystem Intel® Server Chassis SC5600
Revision 1.1
Intel order number E39532-004
34
5.1.6.2 Over Voltage Protection
The power supply will shut down and latch off after an over-voltage condition occurs. The
voltage shall never exceed the maximum levels when measured at the power pins of the power
supply connector during any single point of fail. The voltage shall never trip any lower than the
minimum levels when measured at the power pins of the power supply connector. 5 Vsb (stand-
by) will be auto-recovered after removing the Over Voltage Protection limit.
5.1.6.3 Over Temperature Protection
In an Over Temperature condition, the power supply will shut down. When the power supply
temperature drops to within specified limits, the power supply will restore power automatically,
while the 5 VSB always remains on. The over temperature protection circuit has built-in
hysteresis such that the power supply will not oscillate on and off due to a temperature
recovering condition. The over temperature protection trip level shall have a minimum of 4 °C of
ambient temperature hysteresis.
5.1.7 670-W Power Supply Control and Indicator Functions
The following sections define the input and output signals from the power supply.
Signals that can be defined as low true use the following convention:
Signal
#
= low true.
5.1.7.1 PSON
#
Input Signal
The PSON
#
signal is required for remotely turning on or off the power supply. PSON
#
is an
active low signal that turns on the +3.3 V, +5 V, +12 V, and -12 V power rails. When this signal
is not pulled low by the system or left open, the outputs (except the +5 VSB) turn off. This signal
is pulled to a standby voltage by a pull-up resistor internal to the power supply.
5.1.7.2 PWOK (Power OK) Output Signal
PWOK is a power OK signal and is pulled HIGH by the power supply to indicate all the 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. The start of the
PWOK delay time shall be inhibited as long as any power supply output is in current limit.
5.1.8 670-W Power Supply Mean Time Between Failures (MTBF)
The power supply shall have a minimum MTBF at continuous operation of 100,000 hours at
75% load at 40° C, as calculated by Bell core RPP, or 250,000 hours demonstrated at 75% load
at 40
° C.