Technical Product Specification

Intel
®
Server Chassis P4000S Family TPS Chassis Power Sub-system
Revision 1.5 Intel order number G22850-006
29
Figure 22. PSON# Required Signal Characteristic
2.1.8.2 PWOK (Power OK) Output Signal
PWOK is a power OK signal and will be 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 will be de-asserted to a LOW state. See below
table for a representation of the timing characteristics of PWOK. The start of the PWOK delay
time shall be inhibited as long as any power supply output is in current limit.
Table 24. PWOK Signal Characteristics
Signal Type
Open collector/drain output from power supply. Pull-up to VSB
located in system.
PWOK = High
Power OK
PWOK = Low
Power Not OK
MIN
MAX
Logic level low voltage, Isink=4mA
0V
0.4V
Logic level high voltage, Isource=200A
2.4V
5.25V
Sink current, PWOK = low
4mA
Source current, PWOK = high
2mA
PWOK delay: Tpwok_on
100ms
500ms
PWOK rise and fall time
100sec
Power down delay: T pwok_off
1ms
2.2 550W Power Supply
This 550W power supply specification defines a non-redundant power supply that supports
pedestal entry server systems. The 550W power supply has 7 outputs; 3.3V, 5V, 12V1, 12V2,
12V3, -12V, and 5Vsb, with no less than 550W. The power supply has an AC input and is power
factor corrected.
 1.0 V
PS is
enable
d
 2.0 V
PS is
disable
d
1.0
V
2.0
V
Enabled
Disabled
0.3V ≤ Hysteresis ≤ 1.0V
In 1.0-2.0V input voltages range is
required
5.25V
0V