ATX12V Power Supply Design Guide
Version 2.0
Table 10. DC Output Noise/Ripple
Output
+12 V1DC
+12 V2DC
+5 VDC
+3.3 VDC
+5 VSB
Max. Ripple & Noise
(mVpp)
120
200
50
50
120
50
Power Supply | V out |
|
|
AC Hot |
|
|
|
AC Neutral | V return | 10uf | 0.1uf |
|
|
|
AC Ground
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
Load must be isolated from the ground of the power supply.
Filter Note:
0.1uf - Kemet, C1206C104K5RAC or equivalent 10uf - United
equivalent
Scope
Scope Note:
Use Tektronix TDS460 Oscilloscope or equivalent and a P6046 probe or equivalent.
Figure 5. Differential Noise Test Setup
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