AN1842 APPLICATION NOTE

12/17

Figure 24. EN55022 Class-B Peak Measure

Figure 25. EN55022 Class-B Peak Measure 230

Thermal measures

In order to check the reliability of the design a thermal mapping by means of an IR camera has been done.

In the table here below the temperature of some salient components is reported at 115Vac and 230Vac

input voltage, at ambient temperature (24°C).

As visible in the above table there are not component working at a temperature level that can be consid-

ered critical for their reliability.

@115Vac

@230Vac

Point

Reference

Description

Temperature

Temperature

A

D9

BRIDGE RECTIFIER

74

°C54°C

B

L2

FILTER COIL

56

°C40°C

CQ4

POWERMOS

70

°C58°C

D

T1

POWER TRANSF.

53

°C56°C

E

D16

+5V RECTIFIER

61

°C60°C

F

D13

+12V RECTIFIER

64

°C64°C