Protection Circuits; Over-Current Protection (Ocp); Over Voltage Protection (Ovp); Table 13. Voltage Regulation Limits - Intel SR1500 - AXXMINIDIMM DDR-2 RAID Controller Cache Memory Manual

Power Sub-system
Output
+ 12V
+ 5Vsb
2.8

Protection Circuits

Protection circuits inside the PDB and the power supply shall cause either the power supply's
main +12V output to shutdown, which in turn shuts down the other 3 outputs on the PDB or first
shut down any of the 3 outputs on the PDB, which in turn also shuts down entire power supply
combo. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF for
15sec min or a PSON
2.8.1

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 combination (PS+PDB) shall shutdown and latch off
after an over current condition occurs. This latch shall be cleared by toggling the PSON
or 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. Also, the +12 V output from the power supply is
divided on the PDB into 4 channels and each is limited to 240 VA of power. There shall be
current sensors and limit circuits to shut down the entire PS+PDB if the limit is exceeded. The
limits are listed below. -12 V and 5 VSB shall be protected under over current or shorted
conditions so that no damage can occur to the power supply. Auto-recovery feature is a
requirement on 5 VSB rail.

Table 14. Over Current Protection Limits / 240VA Protection

Output Voltage
+3.3V
+5V
-12V
+12V1
+12V2
+12V3
+12V4
+5Vsb
2.8.2

Over Voltage Protection (OVP)

Each DC/DC converter output on PDB shall have individual OVP protection circuits built in and it
shall be locally sensed. The PS+PDB shall shutdown and latch off after an over voltage
condition occurs. This latch shall be cleared by toggling the PSON
interruption. The following table provides contains 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.
18

Table 13. Voltage Regulation Limits

TOLERANCE
- 5% / +5% +11.40
- 5% / +5% +4.75
#
cycle HIGH for 1sec shall be able to reset the power supply and the PDB.
MIN OCP TRIP LIMITS
13.2A
26A
protected under over current or shorted conditions
18.2A
18.2A
18.2A
18.2A
protected under over current or shorted conditions w/auto recovery

Table 15. Over Voltage Protection (OVP) Limits

Intel order number D31982-006
MIN NOM
+12.00
+5.00
MAX OCP TRIP LIMITS
18A
30A
20A
20A
20A
20A
Intel® Server System SR1550AL
MAX UNITS
+12.60 V
DC
+5.25 V
DC
#
signal or by an AC power
Revision – 1.3
#
signal