Technical Product Specification

Intel® Server System SR2612UR TPS Cooling Subsystem
Revision 1.3
Intel order number E76293-003
23
The DC/DC converters are not damaged from repeated power cycling in this condition. 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. If the limit is exceeded, current sensors and limit circuits shut down the entire
PS and PDB. The following table lists the limits.
Table 16. Over-current Protection Limits / 240 VA Protection
Output Voltage
Minimum OCP Trip Limits
Maximum OCP Trip Limits
+3.3 V
110% min (= 26.4 A min)
150% max (= 36 A max)
+5 V
110% min (= 33 A min)
150% max (= 45 A max)
-12 V
125% min (= 0.625 A min)
400% max (= 2.0 A max)
+12 V1
26.0 A min
32 A max
+12 V2
26.0 A min
32 A max
+12 V3
112.5% min (= 18.0 A min)
20 A max
+12 V4
112.5% min (= 18.0 A min)
20 A max
3.8.2 Over-voltage Protection (OVP)
Each DC/DC converter output on the PDB has individual built-in OVP circuits and they are
locally sensed. The PS and PDB shut down and latch 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 measured at the PDB harness connectors. The voltage never exceeds the
maximum levels when measured at the power pins of the output harness 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 PDB connector.
Table 17. Over-voltage Protection (OVP) Limits
Output Voltage OVP Minimum
(V)
OVP Maximum
(V)
+3.3 V
3.9
4.5
+5 V
5.7
6.5
+5 VSB
5.7
6.5
-12 V
-13.3
-14.5
+12 V1/2/3/4
13.0
14.5
3.8.3 Over-temperature Protection (OTP)
The power supply is protected against over-temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition, the power supply shuts down.
When the power supply temperature drops to within specified limits, the power supply restores
power automatically while the 5 VSB remains constantly on. The OTP trip level has a minimum
of 4°C of ambient temperature hysteresis, so the power supply does not oscillate on and off due
to a temperature recovery condition. The power supply alerts the system of the OTP condition
through the power supply FAIL signal and the PWR LED.