Hold-up time (bridging time)
Hold-up time is a bridging time that describes the period during which the specified output power continues to be provided in the event of an input voltage failure. Even normal power supply units can bridge short-term power failures of up to a few seconds using appropriately dimensioned input storage electrolytic capacitors. The bridging time is extended and is 25 ms. Given the high capacity of the power supply, this is not easy. Only the legendary Corsair AX1600i achieves a longer bridging time.
Inrush current (starting current or inrush current)
All power supply units generate a so-called inrush current, which often far exceeds their nominal current consumption. The causes are the charging of the different capacitances in the input circuit and in the EMC filters, the build-up of the magnetic field in the transformer core and even the charging of the capacitors in the output filter. Only when the converter is operating stably does this input current drop back to normal values. We were unable to take inrush current measurements because it was impossible to completely drain the bulk caps. This means a good design, which is of course a positive thing. For this reason, you will not find the C1500 in the graphic above.
Timings
The power supply supports alternative low-power modes. For maximum mainboard compatibility, T1 should be less than 100 ms.
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