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October 2014 DocID16493 Rev 2 1/25
25
AN3089
Application note
19 V - 65 W quasi-resonant flyback adapter using L6566B and
TSM1014
Federico Levati
Introduction
This application note describes the characteristics and features of a 65 W demonstration
board (EVL6566B-65W-QR), tailored to the specifications of a typical hi-end portable
computer power supply. The peculiarities of this design are the very high average efficiency
of about 90%, without synchronous rectification, and very low no load consumption of
100 mW at 230 Vac. The result is that this converter is more than compliant with Energy
Star
®
eligibility criteria (EPA rev. 2.0 EPS).
Figure 1. EVL6566B-65W-QR: 65 W adapter demonstration board
www.st.com
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