Intel
®
Entry Server Chassis SC5299-E TPS Power Sub-system
Revision 3.1
Intel order number D37594-005
75
Residual voltage at the power supply outputs for no load condition do not exceed 100mV when
AC voltage is applied and the PSON# signal is de-asserted.
2.4.3.8 Soft Start Requirements
The power supply contains a control circuit, which provides monotonic soft start for its outputs
without overstress of 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.
2.4.4 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.
2.4.4.1 Over-current Protection (OCP)/240VA Protection
Each DC/DC converter output on the cage has individual OCP circuits. The PS+cage combo will
shutdown 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 is limited to 240VA of power except for +12V5 (+12V5 is not user accessible). There are
current sensors and limit circuits available to shut down the entire PS+PDB combo if the limit is
exceeded. The over-current limits are listed in the following table.
Table 91. 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
+12V3 18A 20A max
+12V4 18A 20A max
+5VSB See the Power Supply specification for details.
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