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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
63
† Measured relative to the power supply DC common output ground pins
5.6.3 Power Good (Output)
Each power supply provides a power good signal. A pin must be allocated for this signal. This
signal indicates that all outputs have reached acceptable operating voltage. The power good sig-
nal levels and sourcing/sinking requirements are shown in Table 5-10: Power Good Signal. The
power good signal is an output signal from the power supply to the system.
† Measured relative to the power supply DC common output ground pins.
The power good signal is held low until all outputs have reached at least 90% of their respective
operating voltages. The turn on delay for the power good signal is between 100 and 1500 milli-
seconds.
The power good signal is low for a minimum of 1 millisecond before any of the output voltages fall
below the regulation limits. Tests are conducted with a maximum load and minimum line voltage.
Table 5-9: AC Good Signal
AC OK Signal Voltage Level † Current
LOW: AC is not yet up to the level. 0.4 V max 4 mA min sink current
HIGH: AC is up to the level. 4 V min 0.5 mA max source current
Table 5-10: Power Good Signal
Power Good Signal Voltage Level † Current
LOW STATE DE-ASSERTED
(Power Not Good)
0.4 V max 4 mA min sink current
HIGH STATE ASSERTED
(Power Good)
4 V min 0.5 mA max source current