AN1376 datasheet(26/35 Pages) STMICROELECTRONICS

Part #	AN1376

Description	25W QUASI-RESONANT FLYBACK CONVERTER FOR

PDF	35 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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26 / 35 page

AN1376 APPLICATION NOTE

26/35

18 THERMAL MEASURES

In order to check the reliability of the design a thermal mapping by means of an IR Camera

was done. Here below the thermal measures on the board, at both nominal input voltages at

ambient temperature (24 °C) are shown. The pointers A¸E have been placed across some key

components, affecting the reliability of the circuit. The points correspond to the following com-

ponents:

As shown on the maps, all the other points of the board are within the temperature limits as-

suring a reliable performance of the devices.

Figure 28.

component side

Input coil - L1

PowerMOS – Q1

+7V diode – D7

+3.3V diode – D8

+5V regulator – IC3

@115VAC - FULL LOAD

COMPONENT SIDE

A 47.41°C

B 47.24°C

C 78.39°C

D 59.02°C

E 70.67°C

SMD SIDE

AN1376 Datasheet(PDF) 26 Page - STMicroelectronics