SLOS528F July   2009  – April 2017 TPA3110D2

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and F unctions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 DC Characteristics: 24 V
    6. 7.6 DC Characteristics: 12 V
    7. 7.7 AC Characteristics: 24 V
    8. 7.8 AC Characteristics: 12 V
    9. 7.9 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 TPA3110D2 Modulation Scheme
        1. 9.3.1.1 Ferrite Bead Filter Considerations
        2. 9.3.1.2 Efficiency: LC Filter Required With The Traditional Class-D Modulation Scheme
        3. 9.3.1.3 When to Use an Output Filter for EMI Suppression
      2. 9.3.2 Gain Setting Via GAIN0 And GAIN1 Inputs
      3. 9.3.3 Differential Inputs
      4. 9.3.4 PLIMIT
      5. 9.3.5 GVDD Supply
      6. 9.3.6 PBTL Select
      7. 9.3.7 Thermal Protection
      8. 9.3.8 DC Detect
      9. 9.3.9 Short-Circuit Protection and Automatic Recovery Feature
    4. 9.4 Device Functional Modes
      1. 9.4.1 SD Operation
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Stereo Class-D Amplifier With BTL Output and Single-Ended Inputs With Power Limiting
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Input Resistance
          2. 10.2.1.2.2 Input Capacitor, CI
          3. 10.2.1.2.3 BSN and BSP Capacitors
          4. 10.2.1.2.4 Using Low-ESR Capacitors
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Stereo Class-D Amplifier With PBTL Output and Single-Ended Input
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curve
  11. 11Power Supply Recommendations
    1. 11.1 Power Supply Decoupling, CS
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Development Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

11 Power Supply Recommendations

The TPA3110D2 is designed to operate form an input voltage supply range between 8-V and 26-V. Therefore, the output voltage range of power supply should be within this range and well regulated. The current capability of upper power should not exceed the maximum current limit of the power switch.

11.1 Power Supply Decoupling, CS

The TPA3110D2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. Optimum decoupling is achieved by using a network of capacitors of different types that target specific types of noise on the power supply leads. For higher frequency transients due to parasitic circuit elements such as bond wire and copper trace inductances as well as lead frame capacitance, a good quality low equivalent-series-resistance (ESR) ceramic capacitor of value between 220 pF and 1000 pF works well. This capacitor should be placed as close to the device PVCC pins and system ground (either PGND pins or PowerPAD™) as possible.

For mid-frequency noise due to filter resonances or PWM switching transients as well as digital hash on the line, another good quality capacitor typically 0.1 μF to 1 µF placed as close as possible to the device PVCC leads works best. For filtering lower frequency noise signals, a larger aluminum electrolytic capacitor of 220 μF or greater placed near the audio power amplifier is recommended.

The 220-μF capacitor also serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs. The PVCC terminals provide the power to the output transistors, so a 220 µF or larger capacitor should be placed on each PVCC terminal. A 10-µF capacitor on the AVCC terminal is adequate. Also, a small decoupling resistor between AVCC and PVCC can be used to keep high frequency class D noise from entering the linear input amplifiers.