15. Radiated Emissions Measurement Results
Radiated emissions have been measured of the Si3406-non-ISO-FB EVB board with 50 V input voltage and full load connected to the
output – 12.5 W.
As shown below, the Si3406-non-ISO-FB EVB is fully compliant with the international EN 55022 class B emissions standard.
Figure 15.1. Si3406-Non-Isolated Flyback EVB Radiated Emissions Measurement Results; 50 V Input, 5 V Output, 12.5 W Out-
put Load
15.1 Radiated EMI Measurement Process
The EVB is measured at full load with peak detection in both vertical and horizontal polarizations. This is a relatively fast process that
produces a red curve (vertical polarization) and a blue curve (horizontal polarization). Next, specific frequencies are selected (red stars)
for quasi-peak measurements. The board is measured again at those specific frequencies with a quasi-peak detector, which is a very
slow but accurate measurement. The results of this quasi-peak detector measurement are the blue rhombuses.
The blue rhombuses represent the final result of the measurement process. To have passing results, the blue rhombuses should be
below the highlighted EN 55022 Class B limit.
UG332: Class 3 Non-Isolated Evaluation Board for the Si3406
Radiated Emissions Measurement Results
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