Technical Product Specification

350W Power Subsystem Intel® Server System R1304BTSSFAN/ R1304BTLSFAN/ R1304BTLSHBN TPS
OFF for 15sec min (with +5VSB/0.1A) and a PSON# cycle HIGH for 1sec shall be able to reset
the power supply.
4.8.1
Over Current Protection (OCP)
Each output shall have individual OCP protection circuits. The PSU shall shut down and latch
off after an over current condition occurs. Whereas OCP of +5VSB shall turn the power supply
into “hiccup mode” until the OCP condition removed. The values are measured at the PSU
harness connectors and shall not be damaged from repeated power cycling in this condition.
There shall be current sensors and limit circuits to shut down the entire power supply if the limit
is exceeded. The limits are listed in the following table.
Table 23. 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
4.8.2
Over Voltage Protection (OVP)
Each output shall have individual OVP protection circuits built in and it shall be locally sensed.
The PSU shall shut down and latch off after an over voltage condition occurs. The output
voltages are measured at the harness connectors. The voltage shall never exceed the
maximum levels when measured at the power pins of the output harness connector during any
single point of fail. The voltage shall never trip any lower than the minimum levels when
measured at the power pins of the connector.
Table 24. 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
4.8.3
Over Temperature Protection (OTP)
The power supply shall 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 shall restore
power automatically, while the +5VSB remains always on. The OTP trip level shall 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.
Revision 2.4
22