SLVA824A January   2017  – July 2025 TAS6422-Q1 , TAS6424-Q1 , TAS6424L-Q1 , TPA3111D1-Q1 , TPA3221 , TPA3244 , TPA3245 , TPA3250 , TPA3251 , TPA3255 , TPA3255-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Overview
  6. 3Schematic and Design
    1. 3.1 Partial Diagnostic Circuits
    2. 3.2 Tuning the Circuit
    3. 3.3 Circuit Parameters
    4. 3.4 Operation
  7. 4Schematic and Bill of Materials
  8. 5Summary
  9. 6Revision History

Abstract

This application note provides design information for an external load diagnostics circuit to detect and identify electrical faults between the output of an audio amplifier and a target speaker. While the TPA3111D1-Q1 class-D amplifier is used as an example in this application note, this design methodology is relevant for most class-D amplifiers to provide external fault diagnostics.