Intel SR6850HW4 - Manual (Page 70)

Power Supply Intel® Server Platform SR6850HW4 TPS
Revision 1.0
Intel order number D23151-001
58
5.4.4 Over-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
+12V 6 122 141
+12V 7 142 163
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 +3.3V
stby
will not cause the +3.3V
stby
to turn off. A fault on +3.3V
stby
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
+3.3V
stby
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.
5.4.5 Short 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 +3.3V
stby
is shorted the output may go into "hiccup mode". When the +3.3V
stby
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.
5.4.6 Reset 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:
ƒ Removing AC input power, waiting for +3.3V
stby
to drop below 1.0V, then reapplying AC
power. The time it takes for +3.3V
stby
to drop below 1.0V shall not exceed 15 seconds.
ƒ Cycling the state of PS_ON from on to off to on. The minimum cycle time is 1ms.