OCPRF100 MP Server System Technical Product Specification

Revision 1.0

5.5.4.4Over-voltage Protection

The power supply over-voltage protection is sensed locally. The power supply will shut down in a latch off mode after an over-voltage condition. The latch is cleared by toggling the power supply on signal, or by an AC power interruption of greater than 1 second but less than 10 seconds to reset from the latch off condition. This limit applies over all specified AC input voltages and output loading conditions. Table 5-6:Over-voltage Protection contains the over-voltage limits. The values are measured at the output of the power supply connector.

 

 

Table 5-6: Over-voltage Protection

 

 

 

 

 

 

 

Output Voltage

 

Protection Point [ V]

 

 

 

 

 

 

 

+3.3 V

 

3.8 – 4.3

 

 

 

 

 

 

 

+5 V

 

6.0 – 6.5

 

 

 

 

 

 

 

+12 V

 

13 – 14

 

 

 

 

 

 

 

 

 

 

 

5.5.4.5Over-current Protection

The power supply has current limits to prevent the +3.3 Vdc, +5 Vdc, and +12 Vdc outputs from exceeding the values shown in Table 5-7:Over-current Protection. The current limiting is of the voltage fold-back type. The over-current limit level is maintained for a period of 1.6 seconds minimum and 2.0 seconds maximum. After this time, the power supply latches off. The latch will be cleared as described in Section Over-voltage Protection. The power supply will not be damaged from repeated power cycling in this condition.

 

 

Table 5-7: Over-current Protection

 

 

 

 

 

 

 

Voltage

 

Over Current Limit

 

 

 

 

 

 

 

+3.3 V

 

39.6 A minimum; 46.8 A maximum

 

 

 

 

 

 

 

+5 V

 

39.6 A minimum; 46.8 A maximum

 

 

 

 

 

 

 

+12 V

 

46 A minimum; 51 A maximum

 

 

 

 

 

 

 

 

 

 

 

5.5.4.6Short Circuit Protection

The power supply will not be damaged by application of a short circuit to any DC output. Short circuits will not turn into the over-current protection process described in Section Over-current

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