03
AC Hot
AC Neutral
Power Supply
Vout
Vreturn
10uF
0.1uF
Load
Scope
AC Ground
Figure 1. Ripple/Noise voltage test circuit
2.4 Overshoot
Any overshoot at turn on or turn off shall be less 10% of the nominal voltage value, all
outputs shall be within the regulation limit of section 2.0 before issuing the power good
signal of section 4.0.
2.5 Efficiency
2.5.1
Power supply typical efficiency is 80% min under 20% Load / 50% Load / 100%
Load at nominal input voltage of 115VAC .
2.5.2 Other Low Power System Requirements
To help meet the Blue Angel*, RAL-UZ 78, US Presidential executive order 13221, future
EPA requirements, and other low Power system requirements, it is recommended that
the +5VSB standby supply should be as efficient as possible. Standby efficiency is
measured with the main outputs off (PS_ON# high state). Standby efficiency should
be greater than 50% with a minimum loading of 100mA at input 115Vac. Pin 1W with a
minimum loading of 50mA at input 230Vac.
2.6 Remote on/off control
When the logic level "PS-ON" is low, the DC outputs are to be enabled.
When the logic level is high or open collector, the DC outputs are to be disabled.
2.3.3 Ripple/Noise voltage test circuit
