SilverStone ST50F-ESG - Manual (Page 8)

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3.5.3 SHORT-CIRCUIT PROTECTION
An O/P short circuit is defined as any O/P impedance of less then 0.1 ohms. The power
supply shall shutdown and latch off for shorting +3.3V, +5V or +12V rail to return or any
other rail. and +5VSB shall not cause any damage to the power supply. The power supply
shall either shutdown and latch off or fold back for shorting negative rail. +5VSB must be
capable of being shorted indefinitely, but when the short is removed, the power supply
shall recover automatically or by cycling PS_ON#. The power supply shall be capable
withstanding a continuous short-circuit to the O/P without damage or overstress to the unit
(for example to components, PCB traces, connectors) under the I/P conditions specified.
3.6 OUTPUT RISETIME
The cold-start enable main output voltage rise-time of all outputs shall be measured with
maximum load on all outputs. (with COND.9)
Rise time: +3.3V 20mS (maximum)
(10-90%) +5V 20mS (maximum)
+12 V 20mS (maximum)
-12 V 20mS (maximum)
The test condition: 115Vac/60Hz
3.7 OUTPUT OVERSHOOT/UNDERSHOOT
No output voltage shall overshoot / undershoot or generate spikes at turn-on or turn-off, during
momentary power loss, output short, or realistic input voltage or output load changes,
Overshoot/undershoot is defined as any output that exceeds the voltage tolerance plus or minus
an additional 5%. All outputs shall be measured with minimum load (COND.3)
3.8 EFFICIENCY REQUIREMENT OF MAIN OUTPUT
The PSU should be at 87% efficiency with 100% of full load, at 90% efficiency with 50% of full
load and at 87% efficiency with 20% of full load in a “light” load or ideal condition. That should
be tested at nominal Input voltage is 115V/60Hz and load conditions defined in below Table.
Overshoot
+3.3V
+5V
+12V
-12V
+5Vsb
3.63V
5.5V
13.2V
-13.8V
5.5V
2.97V
4.5V
10.8V
-10.2V
4.5V
Undershoot