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Power Amplifiers for Constant Voltage Audio Systems
SLAA898
September 2022
TAS3251
,
TPA3255
CONTENTS
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Power Amplifiers for Constant Voltage Audio Systems
Abstract
Trademarks
1
Introduction
1.1
Power Amplifiers
1.2
Discrete Power Amplifier Implementation
1.3
Class-D Amplifier Implementation
1.4
Advantage of a Class-D Implementation
2
Background
2.1
Why Use Constant Voltage Audio Systems
2.2
Basic Principle of Constant Voltage Systems
2.3
Power Loss in Transformer
2.4
Auto-Transformer
3
System Test (Based on TPA3255)
3.1
Transformer Characteristics
3.1.1
Turns Ratio and Resistance Match
3.1.2
DCR of the Transformer
3.2
System Build-Up
3.3
System Test
4
Efficiency Analysis and Optimization
4.1
Efficiency of Three Parts
4.1.1
Efficiency for TPA3255
4.1.2
Efficiency for Step-Up Transformer
4.1.3
Efficiency for Step-Down Transformer 330-040
4.2
Improvements on System Efficiency
4.2.1
Improve Resistance Matching
4.2.2
Apply a Transformer With Less Power Loss
5
Considerations on Building a Constant Voltage System
5.1
Transformer Saturation
5.2
Low DCR
5.3
Resistance Matching
IMPORTANT NOTICE
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