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AN2852 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN2852
Description  This document describes the characteristics and performance of a 90 W wide range input
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2852 Datasheet(HTML) 22 Page - STMicroelectronics

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Thermal measurements
AN2852
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4
Thermal measurements
A thermal analysis of the board was performed using an IR camera, refer to Figure 24 and
25.
Figure 24.
Thermal map at 115Vac - full load
Figure 25.
Thermal map at 230Vac - full load
Table 7.
Temperature of key components (Tamb = 25 °C, emissivity = 0.95 for all
points)
Point
Reference
T [°C] at 115Vac
T [°C] at 230Vac
A
D1 (Input bridge)
49.5
39.5
B
Q1 (PFC MOSFET)
46.4
37.9
C
D4 (PFC diode)
56.8
49.1
D
R6 (NTC)
55.9
47.1
E
L2 (PFC coil)
38.1
35.7
F
Q4 (AHB low-side MOSFET)
43.8
39.2
AM01839v1
°C
90.0
81.9
73.8
65.6
57.5
49.4
41.3
33.1
25.0
AM01840v1
°C
90.0
81.9
73.8
65.6
57.5
49.4
41.3
33.1
25.0



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