AN3203 datasheet(1/49 Pages) STMICROELECTRONICS

部件名	AN3203

功能描述	This application note describes the characteristics and performance

PDF	49 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 49 page

January 2011

Doc ID 17402 Rev 2

1/49

AN3203

Application note

EVL250W-ATX80PL: 250W ATX SMPS

demonstration board

Introduction

This application note describes the characteristics and performance of a 250 W wide range

input and power factor corrected power supply designed to be used in an ATX application.

Good electrical performance allows meeting the most demanding efficiency targets.

The converter consists of four main blocks:

■ A PFC front-end stage using the L6563S PFC controller which generates the +400 V bus

voltage.

■ An AHB (Asymmetrical half bridge) stage using the L6591 ZVS half bridge controller

which performs the conversion from the high voltage bus to the +12 V output providing

insulation.

■ Two DC-DC post-regulator stages using the L6727 which obtain the +5 V and +3.3 V

outputs from the +12 V bus.

■ An auxiliary power supply (STANDBY) stage using the VIPer27H in isolated flyback

configuration which provides the +5 V_SB output with 10 W power capability.

Figure 1.

250 W ATX SMPS demonstration board

www.st.com

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