AN2950 datasheet(28/37 Pages) STMICROELECTRONICS

Part #	AN2950

Description	This document describes

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Testing the board

AN2950

28/37

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

66.6

D4 (output diode)

51.7

VIPer28LN

65.2

Dz (zener diode)

38.4

BR1 (Diode bridge)

38.9

D3 (clamp diode)

AN2950 Datasheet(PDF) 28 Page - STMicroelectronics