AN4165 Datasheet, PDF (27/37 Pages) STMicroelectronics – This document describes a 12 V - 1 A power supply set in non-isolated flyback topology

AN4165
12 Thermal measurements
Thermal measurements
A thermal analysis of the board at full load condition,@ T_AMB = 25 ° C has been performed
using an IR camera. The worst case is V_IN = 85 V_AC, but the nominal input voltage cases
(V_IN = 115 V_AC and V_IN = 230 V_AC) 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 T_AMB = 25 ° C,
V_IN = 85 V_AC, full load
Figure 36. Thermal map at T_AMB = 25 ° C,
V_IN = 115 V_AC, full load
AM13382v1
AM13383v1
Figure 37. Thermal map at T_AMB = 25 ° C,
V_IN = 230 V_AC, full load
Figure 38. Thermal map at T_AMB = 25 ° C,
V_IN = 265 V_AC, full load
AM13384v1
AM13385v1
Table 12. Temperature of key components at V_IN = 85 V_AC /230 V_AC, full load (T_AMB = 25 ° C)
Point
T [° C]
V_IN = 85 V_AC
V_IN = 265 V_AC
Reference
A
82.4
76.6
VIPER26
B
68.3
73.3
Transformer
C
69.1
67.0
Output diode
D
55.4
53.0
Clamping diode
E
24.8
24.9
Room temperature
Doc ID 023661 Rev 1
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