HPS3000 Datasheet, PDF (6/7 Pages) Emerson Network Power – 3000 W output power

Embedded Power for
Business-Critical Continuity
Rev. 7.10.09_81
PWOK# (Power Good)
HPS3000 Series
6 of 7
PWOK# is a power good signal and will be pulled LOW by the power supply to indicate that both the
outputs are above 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 HIGH state.The start of the PWOK#
delay time shall be inhibited as long as the 48 V output is in current limit or the 5 Vsb output is below
the regulation limit.
PSON# Signal Characteristic
Signal Type
PWOK = High
PWOK = LOW
Logic level low voltage, Isink=4mA
Logic level high voltage, Isource=200µA
Sink current, PWOK = low
Source current, PWOK = high
PWOK delay: T_{pwok on}
PWOK rise and fall time
Power down delay: T_{pwok off}
Open collector/drain output from power
supply. Pullup to 5 Vsb external to the power
supply.
ON
OFF
MIN
MAX
0V
0.8 V
2.0 V
4.80 V
4 mA
2 mA
100 msec
1000 msec
100 µsec
1 msec
1000 msec
Power Supply Present Indicator (PRESENT#)
The PRESENT# signal is primarily used to provide a mechanism by which the host system can sense the
number of power supplies physically present (operational or not). This pin is connected to ground in the
power supply.
AC INPUT Present Indicator (ACOK#)
The AC OK# signal is used to indicate presence of AC input to the power supply. This signal shall be
connected to 5 Vsb through a resistor on the host system side.A logic “Low” level on this signal shall
indicate AC input to the power supply is present. A Logic “High” on this signal shall indicate a loss of AC
input to the power supply.
Table 12
ACOK# Signal Characteristics
Signal Type
Pull-up to 5 Vsb through a resistor in the host
system.
PRESENT# = Low
Present
PRESENT# = High
Not present
MIN
MAX
Logic level low voltage, Ising=4mA
0V
0.8 V
Logic level high voltage, Isink=50µA
2.0 V
4.80 V
Sink current, PRESENT# = Low
4 mA
Source current, PRESENT# = High
50 µA