AN1539 STMicroelectronics, AN1539 Datasheet - Page 14

• Manufacturer Part Number: AN1539
• Description: VIPOWER: LOW COST UNIVERSAL INPUT SMPS FOR DIGITAL SET-TOP BOX BASED ON VIPER50
• Manufacturer: STMicroelectronics

AN1539 - APPLICATION NOTE
3.3 EMI MEASUREMENTS
Conducted EMI measurements have been performed according to EN55022 Class B standard, using a
50W LISN and a spectrum analyzer. In Figure 12 and Figure 13 measurement results are shown under
full load condition at nominal 115V
and 230V
input voltage, respectively. Although peak detector has
ac
ac
been used, the measured emission levels are below the AV (average) limit, passing the pre-compliance
test.
Figure 12: Conducted emissions at 110V
(limits EN55022B)
ac
REF 75 dB V
30 MHz
150 kHz
Figure 13: Conducted emissions at 220V
(limits EN55022B)
ac
REF 75 dB V
150kHz
30 MHz
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