Datasheet

Power Sub-system 1U Server Chassis SR1300
Revision 1.2
Intel order number A94544-004
14
2.2.2 Over Temperature Protection
The power supply will be protected against over temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the PSU will shutdown. When
the power supply temperature drops to within specified limits, the power supply shall restore
power automatically, while the 5V StandBy remains always on. The OTP circuit must have built
in hysteresis such that the power supply will not oscillate on and off due to temperature
recovering condition. The OTP trip level shall have a minimum of 4°C of ambient temperature
hysteresis.
2.2.3 Over Voltage Protection
The power supply Over Voltage Protection (OVP) is locally sensed. The power supply shall
shutdown and latch off after an over-voltage condition occurs. This latch shall be cleared by
toggling the PSON
#
signal or by an AC power interruption. The following table contains the
over-voltage limits. The values are measured at the output of the power supply’s connectors.
The voltage shall never exceed the maximum levels when measured at the power pins of the
power supply 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 power supply connector.
Table 9. Over Voltage (OVP) Limits
Output Voltage MIN (V) MAX (V)
+3.3 V 3.9 4.5
+5 V 5.7 6.2
+12 V1,2 13.3 14.5
-12V -13.3 -14.5
+5VSB 5.7 6.5
2.2.4 Power Supply LED Indicator
There will be a single GREEN LED to indicate power supply status. When AC is applied to the
PSU and standby voltages are available the LED shall BLINK GREEN. The LED shall turn ON
GREEN to indicate that all the power outputs are available. Refer to the table below for
conditions of the LED.
Table 10. LED Indicator Modes
Power Supply Condition Power Supply LED
No AC power to PSU OFF
AC present / Only Standby Outputs On BLINK GREEN
Power supply DC outputs ON and OK GREEN