Power supply Subsystem
SPSH4 Server System External Product Specification
Revision
1.11
32
4.2.5 Electrical
Protection Circuits
Protection circuits inside the power supply will cause only the power supply’s main outputs to
shutdown during either an over-voltage or over-current condition. The 5VSB output remains
powered on if the failure does not involve this output. When a protection circuit shuts down the
power supply, both the FAIL LED and the FAIL signal will be activated.
4.2.5.1 Over-Voltage
Protection
Over-voltage protection is sensed inside the power supply. The power supply will shutdown and
latch off following an over-voltage condition. This latch can be cleared by toggling the power
supply PSON
#
signal or by an AC power interruption of greater than 1 second. This over-voltage
limit applies to all specified AC input voltages and output load conditions. Table 24 contains the
over-voltage limits. The values are measured at the output of the power supply DC connector.
Table 24: Over-Voltage Limits
Output Voltage
Protection Point [ V]
+3.3 V
3.8 – 4.5
+5 V
5.6 – 6.5
+12 V
13 – 14.5
4.2.5.2
Over- Current Protection
The power supply has over-current protection on +3.3V, +5V, and +12V outputs. The current
limiting is of the voltage fold-back type. The over-current limit levels specified in Table 25 are
maintained for a period of 2.6-second minimum and 3.6-second maximum. After this time the
power supply will latch off. The power supply cannot be damaged from repeated power cycling
in this condition.
Table 25: Over Current Protection Limits
Voltage
Over-current Limit
+3.3V
44.0 A minimum; 60.0 A maximum
+5V
37.4 A minimum; 51.0 A maximum
+12V
39.6 A minimum; 54.0 A maximum
Note:
Limits specified are per 600W power supply.
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