Technical Product Specification

Intel® Server System SR1560SF TPS Power Sub-System
Revision 1.2
Intel order number D92959-006
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supply will shutdown and latch off. The latch will be cleared by toggling the PSON
#
signal or by
an AC power interruption. The power supply will not be damaged from repeated power cycling
in this condition. -12V and 5VSB will be protected under over-current or shorted conditions so
that no damage can occur to the power supply. Auto-recovery feature is a requirement on 5VSB
rail.
Table 17. Over-current Protection (OCP)
VOLTAGE OVER CURRENT LIMIT (IOUT LIMIT)
+3.3V 110% minimum (= 22A) ; 150% maximum (= 30A)
+5V 110% min (= 26.4A); 150% max (= 36A)
+12V1 18A min; 20A max
+12V2 18A min; 20A max
+12V3 18A min; 20A max
+12V4 18A min; 20A max
-12V 0.625A min; 2.0A max
5VSB 6.0A max
3.5.2 Over-voltage Protection (OVP)
The power supply over-voltage protection is locally sensed. The power supply will shutdown 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 following table contains the over-voltage limits. The
values are measured at the output of the power supply’s connectors. The voltage will never
exceed the maximum levels when measured at the power pins of the power supply connector
during any single point of fail. The voltage will 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 to recover after an over-voltage condition occurs.
Table 18. Over-Voltage Protection (OVP) Limits
Output Voltage MIN (V) MAX (V)
+3.3V +3.9 +4.5
+5V +5.7 +6.2
+12V1,2, 3, 4 +13.3 +14.5
-12V -13.3 -14.5
+5VSB +5.7 +6.5
3.5.3 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 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 has built in hysteresis
such that the power supply will not oscillate on and off due to a temperature recovering
condition. The OTP trip level has a minimum of 4
C of ambient temperature hysteresis.