Technical Product Specification

Intel® Server System SR1600UR TPS Power Subsystem
Revision 1.8 Intel order number E45725-010
21
3.5.1 Over-current Protection (OCP)
The power supply has current limits 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 shuts down and latches off. The latch is cleared by toggling the PSON# signal or by an
AC power interruption. The power supply is not damaged from repeated power cycling in this
condition. -12 V and 5 VSB are 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 15. Over-current Protection (OCP)
Voltage
Minimum OCP Limits (I
out
limit)
Maximum OCP Limits
+3.3 V
115%
150%
+5 V
115%
150%
+12 V1 18.5 A 20 A
+12 V2 18.5 A 20 A
+12 V3 25 A 30 A
+12 V4
18.5 A
20 A
-12 V
0.7 A
3.0 A
5 VSB
115%
6 A
3.5.2 Over-voltage Protection (OVP)
The power supply over-voltage protection is locally sensed. The power supply shuts down and
latches off after an over-voltage condition occurs. This latch is cleared by toggling the PSON#
signal or by an AC power interruption. The over-voltage limits are listed in the following table.
The values are measured at the output of the power supply’s connectors. The voltage never
exceeds the maximum levels when measured at the power pins of the power supply connector
during any single point of fail.
The voltage never trips 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 its over-voltage condition occurs.
Table 16. Over-voltage Protection (OVP) Limits
Output Voltage
Minimum (V)
Maximum (V)
+3.3 V 3.9 4.5
+5 V 5.7 6.2
+12 V1,2, 3, 4
13.3
14.5
-12 V
-13.3
-14.5
+5 VSB
5.7
6.5