AN4165 datasheet(27/37 Pages) STMICROELECTRONICS

Part #	AN4165

Description	This document describes a 12 V - 1 A power supply set in non-isolated flyback topology

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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AN4165

Thermal measurements

Doc ID 023661 Rev 1

27/37

Thermal measurements

A thermal analysis of the board at full load condition,@ TAMB = 25 ° C has been performed

using an IR camera. The worst case is VIN = 85 VAC, but the nominal input voltage cases

(VIN = 115 VAC and VIN = 230 VAC) have also been considered. The results are shown in

Figure 35, 36, 37 and 38 and summarized in Table 12.

Figure 35.

Thermal map at TAMB = 25 ° C,

VIN =85 VAC, full load

Figure 36.

Thermal map at TAMB = 25 ° C,

VIN = 115 VAC, full load

AM13382v1

AM13383v1

Figure 37.

Thermal map at TAMB = 25 ° C,

VIN = 230 VAC, full load

Figure 38.

Thermal map at TAMB = 25 ° C,

VIN = 265 VAC, full load

AM13384v1

AM13385v1

Table 12.

Temperature of key components at VIN = 85 VAC /230 VAC, full load (TAMB = 25 ° C)

Point

T [

° C]

Reference

VIN = 85 VAC

VIN = 265 VAC

82.4

76.6

VIPER26

68.3

73.3

Transformer

69.1

67.0

Output diode

55.4

53.0

Clamping diode

24.8

24.9

Room temperature

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