Technical Product Specification

350W Power Subsystem Intel
®
Server System R1000SP Product Family TPS
18 Intel Order Number G64249-002 Revision 2.0
3.8.1
Over Current Protection (OCP)
Each output must have individual OCP protection circuits. The PSU must shutdown and latch off
after an over current condition occurs. Whereas OCP of +5VSB must turn the power supply into
“hiccup mode” until the OCP condition removed. The values are measured at the PSU harness
connectors and must not be damaged from repeated power cycling in this condition. There must
be current sensors and limit circuits to shut down the entire power supply if the limit is
exceeded. The limits are listed below.
Table 13. Over Load Protection (OCP) Limits
Output Voltage
Continuous Load
Current Limit MIN
Current Limit MAX
+12V1
18.2A
20A
+12V2
18.2A
20A
+5V
19.2A
24A
+3.3V
12A
15A
-12V
4A
+5VSB
4.5A
3.8.2
Over Voltage Protection (OVP)
Each output must have individual OVP protection circuits built in and it must be locally sensed.
The PSU must shutdown and latch off after an over voltage condition occurs. The output
voltages are measured at the harness connectors. The voltage must never exceed the
maximum levels when measured at the power pins of the output harness connector during any
single point of fail.
The voltage must never trip any lower than the minimum levels when
measured at the power pins of the connector.
Table 14. Over Voltage Protection (OVP) Limits
Output Voltage
OVP MIN (V)
OVP MAX (V)
+3.3V
3.7
4.5
+5V
5.7
6.5
+12V1/+12V2
13.3
15.6
-12V
-13.3
-15.6
+5VSB
5.7
6.5
3.8.3
Over Temperature Protection (OTP)
The power supply must be protected against over temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the PSU will shut down. When
the power supply temperature drops to within specified limits, the power supply must restore
power automatically, while the +5VSB remains always on. The OTP trip level must have a
minimum of 4°C of ambient temperature hysteresis, so that the power supply will not oscillate
on and off due to temperature recovery condition.