Ac Inrush; Protection Circuits; Over-Current Protection (Ocp); Over-Voltage Protection (Ovp) - Intel SR1500 - AXXMINIDIMM DDR-2 RAID Controller Cache Memory Manual

Intel® Server System SR2500AL
2.8.5

AC Inrush

AC line inrush current shall not exceed 40A peak for up to one-quarter of the AC cycle, after
which, the input current should be no more than the specified maximum input current. The peak
inrush current shall be less than the ratings of its critical components (including input fuse, bulk
rectifiers, and surge limiting device).
The power supply must meet the inrush requirements for any rated AC voltage, during turn on at
any phase of AC voltage, during a single cycle AC dropout condition as well as upon recovery
after AC dropout of any duration, and over the specified temperature range (T
acceptable that AC line inrush current may reach up to 60A peak for up to 1 msec.
2.9

Protection Circuits

Protection circuits inside the PDB and the power supply shall cause the power supply's main
+12V output to shut down, or shall cause a shut down of any of the three outputs on the PDB.
Either of these shutdowns will result in shutting down the entire power supply / PDB
combination. If the power supply latches off due to a protection circuit tripping, an AC cycle
OFF for 15 seconds shall be able to reset the power supply and the PDB.
2.9.1

Over-Current Protection (OCP)

Each DC/DC converter output on the PDB shall have individual OCP protection circuits. The
power supply and power distribution board (PS and PDB) shall shutdown and latch off after an
over-current condition occurs. This latch shall be cleared by an AC power interruption. The
following table provides the over-current limits. The values are measured at the PDB harness
connectors. The DC/DC converters shall not be damaged from repeated power cycling in this
condition. The +12V output from the power supply is divided on the PDB into four channels
and each is limited to 240VA of power. There shall be current sensors and limit circuits to shut
down the entire PS and PDB if the limit is exceeded. The limits are listed below.

Table 10. Over-Current Protection Limits / 240VA Protection

Output Voltage
+3.3V
+5V
-12V
+12V1
+12V2
+12V3
+12V4
2.9.2

Over-Voltage Protection (OVP)

Each DC/DC converter output on the PDB shall have individual OVP circuits built in and they
shall be locally sensed. The PS and PDB shall shutdown and latch off after an over-voltage
condition occurs. This latch shall be cleared by an AC power interruption. The following table
provides the over-voltage limits. The values are measured at the PDB harness connectors. The
voltage shall never exceed the maximum levels when measured at the power pins of the output
harness connector during any single point of fail. The voltage shall never trip any lower than the
minimum levels when measured at the power pins of the PDB connector.
Revision – 1.6
MIN OCP TRIP LIMITS
110% min (= 26.4A min)
110% min (= 33A min)
125% min (= 0.625A min)
112.5% min (= 18.0A min)
112.5% min (= 18.0A min)
112.5% min (= 18.0A min)
112.5% min (= 18.0A min)
Intel order number D31980-009
1BPower Sub-System
). It is
op
MAX OCP TRIP LIMITS
150% max (= 36A max)
150% max (= 45A max)
400% max (= 2.0A max)
20A max
20A max
20A max
20A max
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