AN3028 datasheet(28/37 Pages) STMICROELECTRONICS

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Thermal measurements

AN3028

28/37

Doc ID 16135 Rev 1

Thermal measurements

A thermal analysis of the board has been performed using an IR camera for the 115 VAC

mains input, full-load condition, both with and without the self-supply function. The results

are shown in Figure 29 and 30 and summarized inTable 17.

It is worth noting that when the self-supply function is used, the VIPer16LN temperature is

higher, due to the power dissipated by the HV startup generator.

Figure 29.

Thermal measurements at 115Vac,

no self-supply

Figure 30.

Thermal measurements at 115Vac,

self-supply

53.0°C

44.8°C

42.5°C

25.6°C

°C

74.7

68.5

62.2

56.0

49.7

43.4

37.2

30.9

24.6

63.5°C

45.0°C

41.7°C

24.4°C

°C

74.7

68.5

62.2

56.0

49.7

43.4

37.2

30.9

24.6

Table 17.

Temperature of key components at 115 Vac full load

Point

Temperature [°C]

Reference

Without self-supply

With self-supply

44.8

45.8

Transformer

42.5

41.7

Output diode

53.0

63.5

VIPer16LN

25.6

24.4

Ambient temperature

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