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January 2009 Rev 1 1/35
AN2852
Application note
EVL6591-90WADP: 90 W AC-DC asymmetrical
half-bridge adapter using L6591 and L6563
Introduction
This document describes the characteristics and performance of a 90 W wide range input
AC-DC adapter based on asymmetrical half-bridge topology (AHB).
The converter comprises a two-stage approach: a PFC front-end stage using the L6563 TM
PFC controller and a DC-DC stage that implements the asymmetrical half-bridge (AHB)
topology driven by the L6591, the new PWM controller dedicated to this architecture.
Thanks to the AHB topology, the system offers good electrical performance (EPA 2.0
compliant) with a low-voltage and high-current output (12 V - 7.5 A).
The order code for this demonstration board is EVL6591-90WADP.
Figure 1. EVL6591-90WADP demonstration board
AM01816v1
www.st.com
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