Power System Control Signals
Power Enable/Disable (PON)
The PON control signal originates on the system board, and it is routed through the power share backplane microcontroller. If the +5 V and +12 V power going to the system board or the peripherals exceeds 240 VA, the backplane microcontroller will disassert the PON control going to each power supply (J4, J6, and J9). This signal is used to enable and disable the power supplies.
Remote Sense Connections
Individual remote sense outputs are provided to each +5 V and +3.3 V power supply section. Remote voltage sense for +5 V and +3.3 V is done on the system board. The +5 V and +3.3 V remote sense lines are routed through the power share backplane and connect to the current sense circuitry.
The +12 V is not sensed remotely. Instead, it is sensed on the power share backplane.
Load Share Connection
In systems with redundant power systems, the +5 V, +3.3 V, and +12 V outputs from each power supply are routed through the power share backplane. The current from each power supply output is monitored with a current monitoring circuit. This current’s value is used to adjust the load share of each power supply output.
Output Power Connections
The +12 V, +5 V, and +3.3 V power outputs are routed through J1 to the system board power connector. The +12 V and +5 V power outputs are also routed through J5 to the peripheral power connector.
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