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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
61
5.5.4.4 Over-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 val-
ues are measured at the output of the power supply connector.
5.5.4.5 Over-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 min-
imum 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.
5.5.4.6 Short 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
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
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