Technical Product Specification

Power Subsystem Intel® Server System R2000IP Product Family TPS
28 Revision 1.1
shall be protected under over-current or shorted conditions, so that no damage can occur to the
power supply.
Table 22. Over Current Protection Limits
Output Voltage
OCP Limits
+12V
70A min; 78A max
+ 5Vsb
4.5Amin; 6.5A max
The OCP limits should be provided in both redundant and non-redundant mode.
3.7.2 Over-voltage Protection (OVP)
The power supply over voltage protection shall be locally sensed. The power supply shall
shutdown and latch off after an over voltage condition occurs. This latch shall be cleared by
toggling the PSON
#
signal or by an AC power interruption. The table below contains the over
voltage limits. The values are measured at the output of the power supply’s connectors. 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.
Table 23. Over Voltage Protection (OVP) Limits
Output Voltage
MIN (V)
MAX (V)
+12V
13.3
14.5
+ 5Vsb
5.7
6.5
3.7.3 Over-temperature Protection (OTP)
The power supply will be protected against over temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the PS module will shutdown.
When the power supply temperature drops to within specified limits, the power supply shall
restore power automatically, while the 5Vsb remains always on. The OTP trip level shall have a
minimum of 4C of ambient temperature hysteresis, so that the power supply will not oscillate on
and off due to temperature recovery condition. The power supply shall alert the system of the
OTP condition from the power supply FAIL signal and the PWR LED.
3.8 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.
3.8.1 PSON# Input Signal
The PSON
#
signal is required to remotely turn on/off the power supply. PSON
#
is an active low
signal that turns on the +12V power rail. When this signal is not pulled low by the system, or left
open, the outputs (except the +5Vsb) turn off. This signal is pulled to +3.3V by a pull-up resistor
internal to the power supply.