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AN2950 Scheda tecnica(PDF) 28 Page - STMicroelectronics

Il numero della parte AN2950
Spiegazioni elettronici  This document describes
PDF  37 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2950 Scheda tecnica(HTML) 28 Page - STMicroelectronics

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Testing the board
AN2950
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Doc ID 15494 Rev 1
2.11
EMI measurements
A pre-compliant test to the EN55022 (class B) European norm has been performed using an
EMC analyzer and a LISN.
First of all, an average measurement of the background noise (board disconnected from the
mains) has been performed and is reported in Figure 46.
Figure 46.
Average measurement of background noise (board disconnected from
mains)
The average EMC measurements at 115 Vac/full load and 230 Vac/full load have then been
performed and the results are shown in Figure 47 and Figure 48 respectively.
Table 19.
Temperature of key components at 115 VAC full load
Point
Temperature (in oC)
Reference
A
66.6
D4 (output diode)
B
51.7
VIPer28LN
C
65.2
Dz (zener diode)
D
38.4
BR1 (Diode bridge)
E
38.9
D3 (clamp diode)



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