Rosewill RP550-2 - Manual (Page 5)

2.2 Efficiency
The power supply is a minimum of 72% efficient under typical load. The “Energy Star”
efficiency of the power supply is a minimum of 50% when the AC input power is 60W.
2.3 Remote ON/OFF control
The power supply DC outputs (with the exception of +5 VSB which is always available)
are enabled with an active-low, TTL-compatible signal (“PS-ON”), When PS-ON is
pulled to TTL low, the DC outputs are enabled. When PS-ON is pulled to TTL high or
open-circuited, the DC outputs are disabled. PS-ON may be active by either electronic
means or a mechanical switch.
2.4 Overshoot at TURN-ON/TURN-OFF
The output voltage overshoot upon the application or removal of the input voltage is
less than 10%.
2.5 Hold-up Time
The power supply will maintain output regulation despite a loss of a minimum of 16 ms
while under full load. Test to be performed at nominal input voltage.
2.6 Power Good Signal
A “power good” signal is asserted by the supply to indicate that the +5VDC output is
within regulation limits.
Power Good Signal Characteristics
Signal Type Open collector TTL compatible
Logic level low <0.8V while sinking 5mA
Logic level high >2.4V while sourcing 500uA
High state impedance 1K (from output to common)
POK delay 100-500ms
Power fall warning time 1ms minimum
3. Protection
3.1 Over Voltage Protection
The power supply prods latch-mode over-voltage protection as defined below:
Nominal output voltage Trigger voltage
+12V 13.4-15.6V
+5V 5.74-7.0V
+3.3V 3.76-4.3V
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POWER SUPPLY
PERFORMANCE