AN3203 datasheet(24/49 Pages) STMICROELECTRONICS

Part #	AN3203

Description	This application note describes the characteristics and performance

PDF	49 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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24 / 49 page

Electrical performance

AN3203

24/49

Doc ID 17402 Rev 2

4.2

Thermal considerations

This demonstration board has been designed for operation with forced air cooling, very

common in ATX power supply applications. As the component temperatures depend on the

type of fan used and on the airflow path inside the board housing, a thermal map of the

board isn’t significant and has not been taken. When the system works at 25 °C with full

load and no forced air, temperatures are not so high. If a heatsink with lower thermal

resistance for MOSFETs Q201 and Q202 is used, fanless operation may be achieved. For

example, the same shape of the heatsink used for D1, Q1, Q2, D3, Q101, and Q102 could

be used for fanless operation. A picture of this application is shown in Figure 18.

Figure 18.

Fanless board

AN3203 Datasheet(PDF) 24 Page - STMicroelectronics