Datasheet

AN4165 Thermal measurements
Doc ID 023661 Rev 1 27/37
12 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]
Reference
V
IN
= 85 V
AC
V
IN
= 265 V
AC
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