Power Sub-System Intel® Storage System SSR212MA
22 Revision 1.4
2.5.2 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
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signal or by an AC power interruption. Table 13 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 12. Over Voltage Protection (OVP) Limits
Output Voltage MIN (V) MAX (V)
+3.3V 3.8 4.3
+5V 5.7 6.5
+12V1 13.5 15.0
+12V2 13.5 15.0
+12V3 13.5 15.0
-12V -13.3 -14.5
+5VSB 5.7 6.5
2.5.3 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. 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 power supply shall
alert the system of the OTP condition via the power supply FAIL signal and the amber LED.
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