OCPRF100 MP Server System Technical Product Specification

Revision 1.0

Protection. A hard short circuit should turn off the power supply immediately. A hard short circuit is defined as when the load level is less than 10 milliohms.

5.5.4.7Current Share Requirements

Equal power sharing of paralleled power supplies is required. The failure of a power supply does not affect the current sharing or output voltages of other power supplies still in operation in a redundant configuration.

The +3.3 V, +5 V, and +12 V output currents of paralleled supplies maintain a load deviation of ± 10% at rated current.

Signals to control current share may consist of one wire connecting all paralleled supplies for each output voltage required to share current. One separate ground wire may be supplied for these signals, if required.

5.6Control Signals

5.6.1Power Supply On (Input)

The power supply on circuit will be safety extra-low voltage (SELV). Upon receiving this signal, the power supply is turned on and power outputs and other signals are provided at the corresponding DC connector output pins. The characteristics of this signal are shown in Table 5-8: Power Supply on Specification. The power supply on is an input signal to the power supply from the system.

Table 5-8: Power Supply on Specification

DC Power Enable Signal

Voltage Level †

Current

 

 

 

HIGH, PWR SUPPLY ENABLED

4 V min

0.5 mA max source current

 

 

 

LOW, PWR SUPPLY DISABLED

1 V max or open circuit

 

 

 

 

†Measured relative to the power supply DC common output ground pins.

5.6.2AC OK Signal (Output)

Each power supply provides an “AC OK” signal. A pin must be allocated for this signal on the DC connector. This signal indicates that input line AC voltage has reached the minimum level to power up the corresponding power supply. This signal is to be utilized by the system to synchronize the power on timing of multiple power supplies within the system. The characteristics of the AC OK signal are shown in Table 5-9: AC Good Signal.

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