Intel® Server System SR1630BC
Power Sub-System
Revision 1.3
Intel order number E44588-003
21
3.5
Protection Circuits
Protection circuits inside the power supply should cause only the power supply’s main outputs
to shut down. If the power supply latches off due to a protection circuit tripping, an AC cycle off
for 15 seconds and a PSON
#
cycle high for 1 second should be able to reset the power supply.
3.5.1
Over-current Protection (OCP)
The power supply should have current limit to prevent the +3.3 V, +5 V, and +12 V outputs from
exceeding the values shown in the following table. If the current limits are exceeded, the power
supply will shut down and latch off. You can clear the latch by toggling the PSON
#
signal or with
an AC power interruption. The power supply should not be damaged from repeated power
cycling in this condition. -12 V and 5 VSB should be protected under over-current or shorted
conditions so no damage can occur to the power supply. Auto-recovery feature is a requirement
on 5 VSB rail.
Table 14. Over-current Protection (OCP)
Voltage
Over-current Limit (Iout limit)
+3.3 V
110% minimum (= 16.5 A) ; 150% maximum (= 22.5 A)
+5 V
110% min (= 11.0 A); 150% max (= 15.0 A)
+12 V1
26 A min; 36 A max
+12 V2
10 A min; 15 A max
-12 V
0.625 A min; 2.0 A max
5 VSB
6.0 A max
3.5.2
Over-voltage Protection (OVP)
The power supply over-voltage protection should be locally sensed. The power supply will shut
down and latch off after an over-voltage condition occurs. You can clear this latch by toggling
the PSON
#
signal or with an AC power interruption. The following table contains the over-
voltage limits. The values are measured at the output of the power supply’s connectors. The
voltage should never exceed the maximum levels when measured at the power pins of the
power supply connector during any single point of fail. The voltage should never trip any lower
than the minimum levels when measured at the power pins of the power supply connector.
Exception: +5 VSB rail should be able to recover after an over-voltage condition occurs.
Table 15. Over-Voltage Protection (OVP) Limits
Output Voltage
Minimum (V)
Maximum (V)
+3.3 V
3.9
4.5
+5 V
5.7
6.2
