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SLOA238–January 2017
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Copyright © 2017, Texas Instruments Incorporated
Achieve Ultra-Low Idle Current With TPA3128D2
Application Report
SLOA238–January 2017
Achieve Ultra-Low Idle Current With TPA3128D2
PeterCao
ABSTRACT
The TPA3128D2 Class D Audio Power Amplifier has ultra-low power loss and helps to extend the battery
life of Bluetooth
®
and wireless speakers and other battery-powered audio systems. The high efficiency of
the TPA3128D2 device allows it to output 2×30 W without external heat sink on a dual layer PCB. This
application note describes the new features in TPA3128D2 and the benefits in application. This application
note also shows some test results to prove the performance improvement by the new features.
Contents
1 General Overview ........................................................................................................... 2
2 Novel Hybrid Mode .......................................................................................................... 2
3 Separated AVCC............................................................................................................. 4
4 Shut Down Individual Channel ............................................................................................ 5
List of Figures
1 PVCC Idle Current vs. Voltage With Snubber ........................................................................... 2
2 PVCC Idle Current vs. Voltage Without Snubber........................................................................ 3
3 PVCC Current During Playing Audio...................................................................................... 3
4 Separate PVCC and AVCC ................................................................................................ 4
5 Connect to RIN+ and RIN- Directly to GND.............................................................................. 5
List of Tables
1 Saved Power in BD Mode .................................................................................................. 4
2 Saved Power in Hybrid Mode.............................................................................................. 4
3 Saved Power in BD Mode .................................................................................................. 5
4 Saved Power in Hybrid Mode .............................................................................................. 5
Trademarks
Bluetooth is a registered trademark of Bluetooth SIG, Inc.
All other trademarks are the property of their respective owners.
