Rosewill RP500-2 Protection, Efficiency, Remote ON/OFF control, Overshoot at TURN-ON/TURN-OFF

PERFORMANCE

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

4 POWER SUPPLY

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