Power Subsystem
Intel®
Server
System SR1625UR TPS
24
Revision 1.5
Intel order number E47487-007
3.7.2
Voltage Regulation
The power supply output voltages must stay within the voltage limits defined in the following
table when operating at steady state and dynamic loading conditions. These limits include the
peak-peak ripple/noise. All outputs are measured with reference to the return remote sense
signal (ReturnS). The +12 V and +5 VSB voltages are measured at the PDB output harness
connector.
Table 16. Voltage Regulation Limits
Output
Tolerance
Minimum
Normal
Maximum
Units
+ 12 V
- 5%/+5%
+11.40
+12.00
+12.60
V
DC
+ 5 VSB
- 5%/+5%
+4.75
+5.00
+5.25
V
DC
3.8
Protection Circuits
Protection circuits inside the PDB and the power supply cause the power supply’s main +12 V
output to shut down, or cause a shutdown of any of the three outputs on the PDB. Any one of
these shutdowns results 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
minimum or a PSON
#
cycle HIGH for 1 second resets the power supply and the PDB.
3.8.1
Over-current Protection (OCP)
Each DC/DC converter output on the PDB has individual OCP protection circuits. The power
supply and power distribution board combination (PS and PDB) shut down 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 over-current limits are measured at the PDB harness connectors.
The DC/DC converters are not damaged from repeated power cycling in this condition. Also,
the +12 V output from the power supply is divided on the PDB into four channels and each is
limited to 240 VA of power. Current sensors and limit circuits shut down the entire PS and PDB
if the limit is exceeded. The limits are listed in the following table. -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 17. Over-current Protection Limits/240 VA Protection
Output Voltage
Minimum OCP Trip Limits
Maximum OCP Trip Limits
+3.3 V
13.2 A
18 A
+5 V
26 A
30 A
-12 V
protected under over-current or shorted conditions
+12 V1
18.2 A
20 A
+12 V2
18.2 A
20 A
+12 V3
18.2 A
20 A
+12 V4
18.2 A
20 A
+5 VSB
protected under over-current or shorted conditions with auto recovery
