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AN4026 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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AN4026 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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AN4026
Thermal map
Doc ID 022603 Rev 1
25/40
5
Thermal map
In order to check the design reliability, a thermal mapping by means of an IR camera was
carried out. In Figure 26 and 27 the thermal measurements of the board, component side, at
nominal input voltage are shown. Some pointers visible on the images have been placed
across key components or showing high temperature. The ambient temperature during both
measurements was 27 °C. All components are working within their operating temperature
range with margin.
Figure 26.
Thermal map at 115 Vac - 60 Hz - full load.
Figure 27.
Thermal map at 230 Vac - 50 Hz - full load
Table 3.
Thermal map reference points
Point
Reference
Description
A
L1
EMI filtering inductor
B
D1
Bridge rectifier
C
L2
PFC inductor – hottest point
D
D4
PFC output diode
E
Q1
PFC MOSFET



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