AN2941 datasheet(23/37 Pages) STMICROELECTRONICS

No. de pieza	AN2941

Descripción Electrónicos	This application note describes the characteristics and the features

PDF	37 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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AN2941

Thermal map

Doc ID 15447 Rev 4

23/37

Thermal map

In order to check the design reliability, a thermal mapping by means of an IR camera was

done. Figure 23 and 24 show the thermal measures of the board, component side, at

nominal input voltage. Some pointers visible on the pictures have been placed across key

components or components showing high temperature. The ambient temperature during

both measurements was 27 °C.

All other components of the board are working within the temperature limits, assuring a

reliable long-term operation of the power supply.

Figure 23.

Thermal map at 115 Vac-60 Hz - full load

Figure 24.

Thermal map at 230 Vac-50 Hz - full load

Table 5.

Thermal maps reference points

Point

Reference

Description

Output rectifier

Flyback power transformer

D4A

Flyback transformer clamping transil

Flyback switch

Input bridge rectifier

PFC switch

°C

90.0

81.3

72.5

63.8

55.0

46.3

37.5

28.8

20.0

°C

90 .0

81 .3

72 .5

63 .8

55 .0

46 .3

37 .5

28 .8

20 .0

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