Technical Product Specification

Power Sub-system Intel® Server Chassis SC5650 TPS
Revision 1.2
Intel order number E39531-004
60
2.3.2.12 Residual Voltage Immunity in Standby Mode
Each DC/DC converter is immune to any residual voltage placed on its respective output
(typically a leakage voltage through the system from standby output) up to 500mV. There is no
additional heat generated, nor is there any stress of any internal components with this voltage
applied to any individual output, or all outputs simultaneously. Residual voltage also does not
trip the power supply protection circuits during turn on.
Residual voltage at the power supply outputs for no-load condition does not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
2.3.2.13 Soft Start Requirements
The power supply contains a control circuit which provides monotonic soft start for its outputs
without overstressing the AC line or any power supply components at any specified AC line or
load conditions. There is no requirement for rise time on the 5VSB, but the turn on/off is
monotonic.
2.3.3 Protection Circuits
Protection circuits inside the cage (and the power supply) cause the power supply’s main +12V
output to shut down, thereby forcing the remaining three outputs on the cage to shut down. If
the power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 sec min
and a PSON
#
cycle HIGH for 1 second will reset the power supply and the PDB.
2.3.3.1 Over-current Protection (OCP) / 240VA Protection
Each DC/DC converter output on the cage has individual OCP circuits. The PS+cage
combination will shut down and latch off after an over-current condition occurs. This latch is
cleared by toggling the PSON
#
signal or by an AC power interruption. The values are measured
at the PDB harness connectors. The DC/DC converters are not damaged from repeated power
cycling in this condition. The +12V output from the power supply is divided on the PDB into 5
channels and each channel is limited to 240VA of power except for +12V5 (+12V5 is not user
accessible). Current sensors and limit circuits are available to shut down the entire PS+PDB
combination if the limit is exceeded. The over-current limits are listed in the following table.
Table 63. Over-current Protection Limits / 240VA Protection
Output Voltage MIN OCP Trip Limits MAX OCP Trip Limits
+3.3V 110% min (= 26.4A min) 150% max (= 36A max)
+5V 110% min (= 33A min) 150% max (= 45A max)
-12V 0.625A 2.0A
+12V1 18A 20Amax
+12V2 18A 20Amax
Output Voltage MIN OCP Trip Limits MAX OCP Trip Limits
+12V3 18A 20A max
+12V4 18A 20A max
+5VSB See the Power Supply specification for details.