SLOS660C January   2010  – October 2015 TPA2028D1

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 Functions
  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 Electrical Characteristics
    6. 7.6 Operating Characteristics
    7. 7.7 I2C Timing Requirements
    8. 7.8 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 Automatic Gain Control
      2. 9.3.2 Operation With DACs and CODECs
      3. 9.3.3 Filter Free Operation and Ferrite Bead Filters
      4. 9.3.4 General I2C Operation
        1. 9.3.4.1 Single- and Multiple-Byte Transfers
        2. 9.3.4.2 Single-Byte Write
        3. 9.3.4.3 Multiple-Byte Write and Incremental Multiple-Byte Write
        4. 9.3.4.4 Single-Byte Read
        5. 9.3.4.5 Multiple-Byte Read
    4. 9.4 Device Functional Modes
      1. 9.4.1 Enable/Disable Amplifier
      2. 9.4.2 TPA2028D1 AGC and Start-Up Operation
        1. 9.4.2.1 AGC Startup Condition
      3. 9.4.3 Short Circuit Auto-Recovery
    5. 9.5 Programming
      1. 9.5.1 TPA2028D1 AGC Recommended Settings
    6. 9.6 Register Maps
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Decoupling Capacitor CS
        2. 10.2.2.2 Input Capacitors CI)
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
    1. 11.1 Power Supply Decoupling Capacitors
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Component Placement
      2. 12.1.2 Trace Width
      3. 12.1.3 Pad Size
    2. 12.2 Layout Example
    3. 12.3 Efficiency and Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Community Resources
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

10.1 Application Information

These typical connection diagrams highlight the required external components and system level connections for proper operation of the device. Each of these configurations can be realized using the Evaluation Modules (EVMs) for the device. These flexible modules allow full evaluation of the device in the most common modes of operation. Any design variation can be supported by TI through schematic and layout reviews. Visit e2e.ti.com for design assistance and join the audio amplifier discussion forum for additional information.

10.2 Typical Application

TPA2028D1 tpa2028d1_typical_app.gif Figure 49. TPA2028D1 Application Schematic

10.2.1 Design Requirements

For this design example, use the parameters listed in Table 13.

Table 13. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Power supply 5 V
Supply current 2-A Maximum
Audio input voltage 0.5 V to VDD - 0.5 V
Speaker impedance 8 Ω

10.2.2 Detailed Design Procedure

10.2.2.1 Decoupling Capacitor CS

The TPA2028D1 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) 1-μF ceramic capacitor (typically) placed as close as possible to the device PVDD lead works best. Placing this decoupling capacitor close to the TPA2028D1 is important for the efficiency of the Class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 4.7 μF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device.

10.2.2.2 Input Capacitors CI)

TPA2028D1 requires input capacitors to ensure low output offset and low pop.

The input capacitors and input resistors form a high-pass filter with the corner frequency, fC, determined in Equation 5.

Equation 5. TPA2028D1 eq1_fc_los592.gif

The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase output offset. Equation 6 is used to solve for the input coupling capacitance. If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.

Equation 6. TPA2028D1 eq2_ci_los592.gif

10.2.3 Application Curves

For application curves, see the figures listed in Table 14.

Table 14. Table of Graphs

DESCRIPTION FIGURE NUMBER
Output Level vs Input Level Figure 9
Output Power vs Supply Voltage Figure 23
Output Power vs Supply Voltage Figure 24