AN4116 datasheet(27/38 Pages) STMICROELECTRONICS

Part #	AN4116

Description	This document describes a 12 V-350 mA power supply

PDF	38 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 38 page

AN4116

Thermal measurements

Doc ID 023220 Rev 1

27/38

Thermal measurements

A thermal analysis of the board has been performed using an IR camera for 85 VAC, 115

VAC, 230 VAC and 265 VAC mains input, full load condition, both with and without the self-

biasing function. The results are shown in the following figures. When the self-biasing

function is used, the VIPER06 temperature is higher, due to the power dissipated by the HV-

startup generator.

Figure 39.

Thermal map at VIN=85 VAC,

TAMB=25 °C, full load; IC externally

biased

Figure 40.

Thermal map at VIN=85 VAC,

TAMB=25 °C, full load; IC self-biased

Figure 41.

Thermal map at VIN=115 VAC, full

load, TAMB=25 °C; IC externally

biased

Figure 42.

Thermal map at VIN=115 VAC, full

load, TAMB=25 °C; IC self-biased

AN4116 Datasheet(PDF) 27 Page - STMicroelectronics