Technical Product Specification

Intel® Server Chassis SC5650 TPS Power Sub-system
Revision 1.2
Intel order number E39531-004
83
Residual voltage at the power supply outputs for a no-load condition does not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
2.4.8.15 Protection Circuits
Protection circuits inside the power supply 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
sec and a PSON# cycle HIGH for 1 sec will reset the power supply.
2.4.8.16 Over-current Protection (OCP)
The power supply has a current limit to prevent the +3.3V, +5V, and +12V outputs from
exceeding the values shown in the following table. If the current limits are exceeded the power
supply will shut down and latch off. The latch will be cleared by toggling the PSON
#
signal or by
an AC power interruption. The power supply will not be damaged from repeated power cycling
in this condition. -12V and 5VSB are protected under over-current or shorted conditions so that
no damage can occur to the power supply. The 5VSB will auto recover after removing the OCP
limit.
Table 95. Over-current Protection (OCP) 240VA
Over-current Limit Peak Load
Voltage
MIN MAX Peak Limit Delay
+3.3V 110% = 26.4A 150% = 36A
+5V 110% = 33A 150% = 45A
+12V1 18A 20A
+12V2 18A 20A
+12V3 18A 20A
+12V4 18A 20A
+12V5 18A 20A
-12V 0.625A 4.0A
5VSB 7.0A
2.4.8.17 Over-voltage Protection (OVP)
The power supply over-voltage protection is locally sensed. The power supply will shut down
and latch off after an over voltage condition occurs. This latch can be cleared by toggling the
PSON
#
signal or by an AC power interruption. The following table contains the over-voltage
limits. The values are measured at the output of the power supply’s pins. 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 will not trip any lower than the minimum levels when
measured at the power pins of the power supply connector. Exception: The +5VSB rail will auto-
recover after an OVP has been cleared.
Table 96. Over-voltage Protection Limits
Output Voltage MIN (V) MAX (V)
+3.3V 3.9 4.5