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Application Report
SNAA057B–June 2008–Revised May 2013
AN-1849 An Audio Amplifier Power Supply Design
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ABSTRACT
This application report provides design information for a power supply for use with our newest offering of
high-performance, ultra high-fidelity audio amplifier input stage ICs.
Contents
1 Introduction .................................................................................................................. 2
2 Overview ..................................................................................................................... 2
3 Schematic and Design ..................................................................................................... 3
3.1 Power Supply ....................................................................................................... 3
4 Bill Of Materials ............................................................................................................. 4
5 Additional Circuit ............................................................................................................ 6
5.1 120V/240V Selection Option ..................................................................................... 6
5.2 Inrush Current Control ............................................................................................. 7
5.3 Power Up/Down Mute Control .................................................................................... 8
6 Summary ................................................................................................................... 11
7 Board Layer Views ........................................................................................................ 12
8 Revision History ........................................................................................................... 16
List of Figures
1 Complete Power Supply Circuit........................................................................................... 4
2 120V Transformer Connections, Primaries in Parallel ................................................................. 6
3 120V Transformer Connections, Primaries in Series................................................................... 6
4 Inrush Current Control...................................................................................................... 7
5 Supply Ramp at Power On ................................................................................................ 7
6 Mute Control................................................................................................................. 8
7 Mute at Power On........................................................................................................... 9
8 Mute at Power Off........................................................................................................... 9
9 Constant Brightness LED Circuit ........................................................................................ 10
10 Constant Brightness LED and Mute Control Circuit .................................................................. 10
11 PCB Composite View From Top ........................................................................................ 12
12 PCB Top Silkscreen View ................................................................................................ 13
13 PCB Bottom Silkscreen View ............................................................................................ 14
14 PCB Top Layer View...................................................................................................... 15
15 PCB Bottom Layer View.................................................................................................. 16
List of Tables
1 Bill Of Materials ............................................................................................................. 4
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SNAA057B–June 2008–Revised May 2013 AN-1849 An Audio Amplifier Power Supply Design
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Verzeichnis
- ・ Blockdiagramm on Seite 3
- ・ Anwendungsbereich on Seite 17
