TIDUFC9 May   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Codec Design
      2. 2.2.2 Class-D Amplifier
        1. 2.2.2.1 Audio Filter Design
      3. 2.2.3 Power Design
      4. 2.2.4 EMC, EMI Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TAC5312-Q1
      2. 2.3.2 TAS5441-Q1
      3. 2.3.3 LMR43620-Q1
      4. 2.3.4 TPS7A52-Q1
      5. 2.3.5 TPD2E007
  9. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Board Connection
      2. 3.1.2 Configuring the Board
    2. 3.2 Software Requirements
      1. 3.2.1 Firmware for Bench Tests
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 Audio Performance
      2. 3.4.2 Power Tests
      3. 3.4.3 EMI, EMC Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 Bill of Materials
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

2.3.2 TAS5441-Q1

The TAS5441-Q1 is a mono digital audio amplifier, an excellent choice for use in automotive emergency call (eCall), telematics, instrument cluster, and infotainment applications. The device provides up to 22W into 4Ω at less than 10% THD+N from a 14.4Vdc automotive battery. The wide operating voltage range and excellent efficiency make the device an excellent choice for start-stop support or running from a backup battery when required. The integrated load-dump protection reduces external voltage clamp cost and size, and the onboard load diagnostics report the status of the speaker through I2C. The design uses an ultra-efficient class-D technology developed by Texas Instruments with features added for the automotive industry. This technology allows for reduced power consumption, reduced heat, and reduced peak currents in the electrical system. The device realizes an audio sound system design with smaller size and lower weight than traditional class-AB designs. The device incorporates load diagnostic circuitry designed for detecting and determining the status of output connections. The device supports the following diagnostics:

  • Short-to-GND
  • Short-to-PVDD
  • Short across load
  • Open load

The device reports the presence of any of the short or open conditions to the system through I2C register read. The load diagnostic function runs on deassertion of STANDBY or when the device is in a fault state such as dc detect, overcurrent, overvoltage, undervoltage, and overtemperature. During this test, the outputs are in a Hi-Z state. The device determines whether the output is a short-to-GND, short-to-PVDD, open load, or shorted load. The load diagnostic biases the output, which therefore requires limiting the capacitance value for proper functioning. The load diagnostic test takes approximately 229ms to run. The check phase repeats up to 5 times if a fault is present or a large capacitor-to-GND is present on the output.

On detection of an open load, the output still operates. On detection of any other fault condition, the output goes into a Hi-Z state, and the device checks the load continuously until removal of the fault condition. After detection of a normal output condition, the audio output starts. The load diagnostics run after every other overvoltage event. The load diagnostic for open load only has I2C reporting. All other faults have I2C and FAULT pin assertion.

TIDA-060048 TAS5411-Q1 Functional Block DiagramFigure 2-8 TAS5411-Q1 Functional Block Diagram
TIDA-060048 TAS5411-Q1 Simplified Block DiagramFigure 2-9 TAS5411-Q1 Simplified Block Diagram