SSI

ERP2U Power Supply Design Guide, V2.31

7.3Over Voltage Protection

STATUS

Required

The power supply over voltage protection shall be locally sensed in the hot swap modules. 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 29 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 28: Over Voltage Limits

Output Voltage

MIN (V)

MAX (V)

+3.3 V

3.9

4.5

 

 

 

+5 V

5.7

6.5

 

 

 

+12V1,+12V2, +12V3, +12V4

13.3

14.5

 

 

 

-12 V

-13.3

-14.5

 

 

 

+5 VSB

5.7

6.5

 

 

 

7.4Over Temperature Protection

STATUS

Recommended

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 OTP trip level shall have a minimum of 4 °C of ambient temperature hysteresis.

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SSI America ERP2U manual Over Voltage Protection, Over Temperature Protection, Over Voltage Limits, Output Voltage

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