Technical Product Specification

Intel
®
Server Chassis P4000S Family TPS Chassis Power Sub-system
Revision 1.5 Intel order number G22850-006
27
T
5VSB_holdup
Time the 5VSB output voltage stays within
regulation after loss of AC.
70
ms
Figure 21. Turn On/Off Timing (Power Supply Signals)
2.1.7 Protection Circuits
Protection circuits inside the power supply causes only the power supply’s main outputs to
shutdown. If the power supply latches-off due to a protection circuit tripping, an AC cycle OFF
for 15sec and a PSON
#
cycle HIGH for 1 sec must be able to reset the power supply.
2.1.7.1 Current Limit (OCP)
Overload currents applied to each tested output rail will cause the output to trip before they
reach or exceed 240 VA. If the current limits are exceeded the power supply shuts down and
latches-off. The latch will be cleared by toggling the PSON
#
signal or by an AC power
interruption. The power supply does not be damaged from repeated power cycling in this
condition. -12V and 5VSB is protected under over current or shorted conditions so that no
damage can occur to the power supply. 5Vsb will be auto-recovered after removing OCP limit.
2.1.7.2 Over Voltage Protection (OVP)
The power supply over voltage protection is locally sensed. The power supply shuts down and
latches-off after an over voltage condition occurs. This latch is cleared by toggling the PSON
#
signal or by an AC power interruption. The table below shows the over voltage limits. The values
are measured at the output of the power supply’s pins. 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. 5Vsb will be auto-recovered after
removing OVP limit.