Protection Circuits; Table 91. Over-Current Protection Limits/240Va Protection - Intel SC5299BRP Technical Product Specification

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Intel Entry Server Chassis SC5299-E TPS
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
+3.3V
+5V
-12V
+12V1
+12V2
+12V3
+12V4
+5VSB
Revision 3.1
MIN OCP Trip Limits
110% min (= 26.4A min)
110% min (= 33A min)
0.625A
18A
18A
18A
18A
See the Power Supply specification for details.
Intel order number D37594-005
Power Sub-system
MAX OCP Trip Limits
150% max (= 36A max)
150% max (= 45A max)
2.0A
20Amax
20Amax
20A max
20A max
75