Intel® Server Chassis SC1400UP / Intel® Server Platform SR1425BK1-E
Revision 1.0
- 64 -
Table 39. Over Current Protection (OCP)
VOLTAGE
OVER CURRENT LIMIT (Iout limit)
+3.3V
16A min; 25A max
+5V
19A min; 30A max
+12V
21A min; 30A max
5VSB
2.5 min; 5.0A max
6.34 Over Voltage Protection (OVP)
The power supply over voltage protection shall be 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.
Table 14
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.
Exception: +5VSB rail should be able recover after its over voltage condition occurs.
Table 40. Over Voltage Protection (OVP) Limits
Output Voltage
MIN (V)
MAX (V)
+3.3V 3.9
4.5
+5V 5.7
6.5
+12V 13.3
15
+5VSB 5.7
6.5
6.35 Over Temperature Protection (OTP)
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 5VSB 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 hysterisis.
6.36 Control and Indicator Functions
The following sections define the input and output signals from the power supply.
Signals that can be defined as low true use the following convention:
signal
#
= low true
