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IntelP®P Server Board S3420GP TPS Design and Environmental Specifications
9.4.11 Residual Voltage Immunity in Standby Mode
The power supply is immune to any residual voltage placed on its outputs (typically, a leakage
voltage through the system from standby output) up to 500 mV. There is no additional heat
generated nor stressing of any internal components with this voltage applied to any individual
output and all outputs simultaneously. It also does not trip the power supply protection circuits
during turn on.
The residual voltage at the power supply outputs for a no-load condition does not exceed 100
mV when AC voltage is applied and the PSON# signal is de-asserted.
9.4.12 Protection Circuits
Protection circuits inside the power supply should cause only the power supply’s main outputs
to shut down. If the power supply latches off due to a protection circuit tripping, an AC cycle
OFF for 15 seconds and a PSON
#
cycle HIGH for 1 second should reset the power supply.
9.4.12.1 Over-current Protection (OCP)
The power supply has current limits to prevent the +3.3 V, +5 V, and +12 V outputs from
exceeding the values shown in the following table. If the current limits are exceeded, the power
supply shuts down and latches off. The latch is cleared by toggling the PSON
#
signal or using
an AC power interruption. The power supply is not damaged from repeated power cycling in this
condition. -12 V and 5 VSB are protected under over-current or shorted conditions so no
damage can occur to the power supply. Auto-recovery feature is a requirement on 5 VSB rail.
Table 64. Over-Current Protection (OCP)
VOLTAGE OVER CURRENT LIMIT
Min Max
+3.3V 15A 21A
+5V 20A 27A
+12V 30A 40A
-12V 0.625A 2A
5VSB N/A 4A
9.4.12.2 Over-Voltage Protection (OVP)
The power supply over-voltage protection is locally sensed. The power supply shuts down and
latches off after an over-voltage condition occurs. You can clear this latch by toggling the
PSON
#
signal or using an AC power interruption. The following table contains the over-voltage
limits. The values are measured at the output of the power supply’s connectors. The voltage
never exceeds the maximum levels when measured at the power pins of the power supply
connector during any single point of fail. The voltage never trips any lower than the minimum
levels when measured at the power pins of the power supply connector.
Exception: +5 VSB rail should be able to recover after an over-voltage condition occurs.
Table 65. Over-voltage Protection (OVP) Limits
Output Voltage Minimum (V) Maximum (V)
+3.3 V 3.9 4.5
Revision 1.0
Intel order number E65697-003
93