AN2242 Datasheet, PDF (1/31 Pages) STMicroelectronics – This document describes a reference design

AN2242
APPLICATION NOTE
Reference design: high performance, L6668-based flyback
converter for Set-Top boxes and PVRs
Introduction
This document describes a reference design of a 40W Switch Mode Power Supply dedicated to
Set-Top box application. The board accepts wide range input voltage (90 to 265Vrms) and
delivers 4 outputs. It is based on the new controller L6668, working in PWM fixed frequency
current mode. High efficiency and low standby consumption are the main characteristics of this
board. Such features, coupled with the minimal part count required and the global solution low
cost approach, makes it an ideal solution for powering digital consumer equipment, meeting
worldwide standby rules.
Figure 1. EVAL6668-STB Demo Board, Described In This Application Note
AN2242/1205
Rev 1.0
1/31
www.st.com
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