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ATX12V Power Supply Design Guide
Version 2.0
20
Table 10. DC Output Noise/Ripple
Output
Max. Ripple & Noise
(mV
pp
)
+12 V1DC 120
+12 V2DC 200
+5 VDC 50
+3.3 VDC 50
-12 VDC 120
+5 VSB 50
Scope
Load
V out
V return
Power Supply
AC Hot
AC Neutral
AC Ground
Scope Note:
Use Tektronix TDS460 Oscilloscope or
equivalent and a P6046 probe or equivalent.
Filter Note:
0.1uf - Kemet, C1206C104K5RAC or equivalent
10uf - United Chemi-con, 293D106X0025D2T or
equivalent
General Notes:
1. Load the output with its minimum load
current.
2. Connect the probes as shown.
3. Repeat the measurement with maximum
load on the output.
Load must be
isolated from the
ground of the
power supply.
0.1uf
10uf
Figure 5. Differential Noise Test Setup