03
2.3 Output Ripple
2.3.2 Definition
2.3.3 Ripple voltage test circuit
2.3.1 Ripple regulation
2.4 Overshoot
Any overshoot at turn on or turn off shall be less 10% of the normal voltage value, all
outputs shall be within the regulation limit of section 2.0 before issuing the power good
signal of section 5.0.
2.5 Efficiency
Power supply efficiency typical 10% load/90%, 20% load/92%, 50% load/94%, 100%
load/90% at 115V AC voltage on all outputs.
The ripple voltage of the outputs shall be measured at the pins of the output connector when
terminated in the load impedance specified in figure 1. Ripple and noise are measured at the
connectors with a 0.1uF ceramic capacitor and a 10uF electrolytic capacitor to simulate
system loading. Ripple shall be measured under any condition of line voltage, output load,
line frequency, operation temperature.
Parameter
+3.3V
+5V
+12V
-12V
+5VSB
Ripple&Noise
50
50
120
120
50
Unit
mVp-p
mVp-p
mVp-p
mVp-p
mVp-p
Figure 1. Ripple voltage test circuit
AC H o t
AC N e u tra l
Power Supply
V o u t
V re tu rn
10uF
0.1uF
L o a d
S cope
AC Gro u n d
