Intel SC5400LX User Manual
Chassis Power Subsystem
Intel® Server Chassis SC5400 5U Kit TPS
48
Revision:
1.0
5.3.4 Protection
Circuits
Protection circuits inside the power distribution board (and the power supply) cause the
following:
following:
The power supply’s main +12V output to shutdown, which in turn shuts down the other
three outputs on the power distribution board or
three outputs on the power distribution board or
Shut down any of the three outputs on the power distribution board, which in turn also
shuts down the entire power supply combo.
shuts down the entire power supply combo.
If the power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15
second minimum and a PSON# cycle HIGH for 1sec shall be able to reset the power supply and
the power distribution board.
second minimum and a PSON# cycle HIGH for 1sec shall be able to reset the power supply and
the power distribution board.
5.3.4.1
Over Current Protection (OCP) / 240VA Current Limit
Each DC/DC converter output on the power distribution board has individual OCP protection
circuits. The power supply will shutdown and latch off after an over current condition occurs.
This latch is cleared by toggling the PSON# signal or by an AC power interruption. Also, the
+12V output from the power supply is divided on the power distribution board into four channels
and each is limited to 240 VA of power. Current sensors and limit circuits shut down the entire
power supply if the limit is exceeded.
circuits. The power supply will shutdown and latch off after an over current condition occurs.
This latch is cleared by toggling the PSON# signal or by an AC power interruption. Also, the
+12V output from the power supply is divided on the power distribution board into four channels
and each is limited to 240 VA of power. Current sensors and limit circuits shut down the entire
power supply if the limit is exceeded.
5.3.4.2
Over Voltage Protection (OVP)
Each DC/DC converter output on the power distribution board has individual OVP protection
circuits built in and 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 values are measured at the power distribution board harness
connectors. The voltage shall never exceed the maximum levels when measured at the power
pins of the output harness 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 distribution
board connector.
circuits built in and 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 values are measured at the power distribution board harness
connectors. The voltage shall never exceed the maximum levels when measured at the power
pins of the output harness 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 distribution
board connector.
5.3.5
Control and Indicator Functions
The following sections define the input and output signals from the power distribution board.
Signals that can be defined as low true use the following convention:
signal# = low true
5.3.5.1
PSON# Input and Output Signals
The PSON# signal is required to remotely turn on/off the power supply.