Control And Indicator Functions; Table 66. Over-Voltage Protection Limits - Intel SC5299BRP Technical Product Specification

Power Sub-system
2.3.4.2 Over-voltage Protection (OVP)
The power supply's over-voltage protection is locally sensed. The power supply will shut down
and latch off after an over-voltage condition occurs. This latch can be cleared by toggling the
#
PSON signal or by an AC power interruption. The following table contains the over-voltage
limits. The values are measured at the output of the power supply's connectors. The voltage
never exceeds the maximum levels when measured at the power pins of the power supply
connector during any single point of fail. The voltage will never trip any lower than the minimum
levels when measured at the power pins of the power supply connector.
2.3.4.3 Over-temperature Protection (OTP)
The power supply is protected against over-temperature conditions caused by loss of fan
cooling, excessive ambient temperature, or excessive loading. Sensing points are placed at hot
spots. In an OTP condition, the power supply will shut down. When the power supply
temperature drops to within specified limits, the power supply restores power automatically,
while the 5VSB always remains on. The OTP circuit has built-in hysteresis such that the power
supply will not oscillate on and off due to temperature recovery conditions. The OTP trip level
has a minimum of 4 degrees C of ambient temperature hysteresis.
2.3.5

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
2.3.5.1 PSON# Input Signal
#
The PSON
signal is required to remotely turn on/off the power supply. PSON
signal that turns on the +12V power rail. When this signal is not pulled low by the system, or left
open, the outputs (except for the +5VSB) turn off. This signal is pulled to a standby voltage by a
pull-up resistor internal to the power supply.
58

Table 66. Over-voltage Protection Limits

Output Voltage
+12V
+5VSB
Intel order number D37594-005
®
Intel Entry Server Chassis SC5299-E TPS
MIN (V) MAX (V)
13.3
5.7
14.5
6.5
#
is an active low
Revision 3.1