Control And Indicator Functions; Table 127. Pson Signal Characteristic - Intel SC5299BRP Technical Product Specification

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Intel Entry Server Chassis SC5299-E TPS
2.5.9.3 Over-temperature Protection (OTP)
The power supply is protected against over-temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the power supply will shut down.
When the power supply temperature drops to within specified limits, the power supply will
restore power automatically, while the 5VSB remains always on. The OTP circuit has a built-in
hysteresis such that the power supply will not oscillate on and off due to a temperature
recovering condition. The OTP trip level has a minimum of 4 degrees C of ambient temperature
hysteresis.
2.5.10

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
2.5.10.1 PSON# Input Signal
#
The PSON signal is required to remotely turn on/off the power supply. PSON
signal that turns on the +3.3V, +5V, +12V, and -12V power rails. 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
a standby voltage by a pull-up resistor internal to the power supply.
Signal Type
#
PSON = Low
#
PSON = High or Open
Logic level low (power supply ON)
Logic level high (power supply OFF)
Source current, Vpson = low
Power up delay: T
pson_on_delay
PWOK delay: T
pson_pwok
Revision 3.1
#
Table 127. PSON Signal Characteristic
Accepts an open collector/drain input from the system.
Pull-up to VSB located in power supply.
Intel order number D37594-005
ON
OFF
MIN
0V
2.1V
5msec
Power Sub-system
#
is an active low
MAX
1.0V
5.25V
4mA
400msec
50msec
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