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VIPER122 Datasheet(PDF) 3 Page - STMicroelectronics

Part # VIPER122
Description  12 V - 5 W isolated flyback converter based on VIPer122LS
PDF  6 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER122 Datasheet(HTML) 3 Page - STMicroelectronics

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2
Noise measurements
The VIPer122 frequency jittering feature allows the spectrum to be spread over frequency bands rather than
being concentrated on single frequency value. Especially when measuring conducted emission with the average
detection method, the level reduction can be several dBµV.
A pre-compliance test for the EN55022 (Class B) European normative was performed and the average
measurements of the conducted noise emissions at full load and nominal mains voltages are shown in the
following figures.
Figure 3. CE average measurement at 115 VAC full
load
Figure 4. CE average measurement at 230 VAC full
load
STEVAL-VP12201F
Noise measurements
DB4121 - Rev 1
page 3/6



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