AN2690 datasheet(20/31 Pages) STMICROELECTRONICS

Part #	AN2690

Description	This application note describes the characteristics and the features

PDF	31 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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20 / 31 page

Thermal map

AN2690

20/31

Thermal map

In order to check the design reliability, a thermal mapping by means of an IR camera was

done. Figure 21 and 22 show the thermal measures of the board, component side, at

nominal input voltage. Some pointers visible on the pictures have been placed across key

components or components showing high temperature. The ambient temperature during

both measurements was 27 °C. All other components of the board are working within the

temperature limits, assuring a reliable long-term operation of the power supply.

Figure 21.

Thermal map at 115 Vac - 60 Hz - full load

Figure 22.

Thermal map at 230 Vac- 50 Hz - full load

Table 4.

Thermal maps reference points

Point

Reference

Description

Bridge rectifier

PFC switch

NTC resistor

Flyback transformer clamping transil

Flyback switch

Flyback power transformer

Output diodes

Input common mode filtering inductor

AN2690 Datasheet(PDF) 20 Page - STMicroelectronics