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AN2242 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN2242
Description  This document describes a reference design
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2242 Datasheet(HTML) 22 Page - STMicroelectronics

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6 Thermal Measures
AN2242
22/31
6
Thermal Measures
In order to check the design reliability, a thermal mapping by means of an IR Camera was
done. Here below the thermal measures of the component board side at nominal input voltage
are shown. Some pointers visible on the pictures have been placed across key components or
components showing high temperature. The correlation between measurement points and
components is indicated on the right of both figures.
TAMB = 28 degC for all measures
Figure 27. 115Vac-Max Load
Figure 28. 230Vac-Max Load
The thermistor, bridge and output diodes temperature rise are compatible with the reliable
operation of the components. Resistor R7 may need a bigger package to decrease its thermal
resistance. All other components of the board are working within the temperature limits
assuring a reliable long term operation of the power supply.
A 83.70°C E= 0.95
R1 (NTC)
B 58.29°C E= 0.95
D1 (BRIDGE)
C 116.60°C E= 0.95
R7 (CLAMP)
D 75.67°C E= 0.95
T1 (WINDING)
E 73.64°C E= 0.95
T1 (FERRITE)
F 98.34°C E= 0.95
D2
G 73.85°C E= 0.95
D10
H 69.91°C E= 0.95
D12
A 94.63°C E= 0.95
R7 (CLAMP)
B 69.85°C E= 0.95
T1 (WINDING)
C 67.62°C E= 0.95
T1 (FERRITE)
D 97.50°C E= 0.95
D2
E 76.15°C E= 0.95
D10
F 69.29°C E= 0.95
D12



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