Power Supply

Intel® Server Platform SR6850HW4 TPS

5.4.4Over-current Protection

Over-current is a fault condition defined as a 10A/s current ramp starting from full load applied to the output under test. A fault on any output causes the rest of the outputs to latch off. See note 3 below the following table.

Table 34. Over-current Protection Limits

Output Level

Minimum (A)2,4

Maximum (A)2,4

+3.3V Standby 1,3,5

5.3

6.2

+12V6

122

141

+12V7

142

163

1.Output is Level III SELV and non-energy hazard complaint

2.The above current limits will be satisfied throughout the entire operating temperature range

3.A fault on any output other than +3.3Vstby will not cause the +3.3Vstby to turn off. A fault on +3.3Vstby will cause the other outputs to turn off.

4.Dynamic loading must not cause a false over current when 2 supplies are in parallel.

5.The +3.3Vstby output will not latch off. It must return to normal operation once the fault is removed. Current foldback method is preferred.

6.+12V OC limits change base on the state of AC_RANGE. This helps protect the power supply from over- loading the PFC stage. AC_RANGE low.

7.+12V OC limits change base on the state of AC_RANGE. This helps protect the power supply from over- loading the PFC stage. AC_RANGE high.

5.4.5Short Circuit Protection

A short circuit, which is defined as an impedance of 0.1Ω, or less, applied to any output during start-up or while running will not cause any damage to the power supply (connectors, components, PCB traces, etc.).

When the +3.3Vstby is shorted the output may go into "hiccup mode". When the +3.3Vstby attempts to restart the maximum peak current from the output must be less than 8.0A. The

maximum average current, taking into account the “hiccup" duty cycle, must be less than 4.0A.

5.4.6Reset After Shutdown

If the power supply latches into a shutdown state due to a fault condition on any output, the power supply will return to normal operation only after the fault has been removed and the power supply has been power-cycled. Power cycling is defined as either:

ƒRemoving AC input power, waiting for +3.3Vstby to drop below 1.0V, then reapplying AC power. The time it takes for +3.3Vstby to drop below 1.0V shall not exceed 15 seconds.

ƒCycling the state of PS_ON from on to off to on. The minimum cycle time is 1ms.

58

Revision 1.0

 

Intel order number D23151-001