JAJSC84F May   2016  – January 2020 TPA3136AD2 , TPA3136D2

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Switching Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Parameter Measurement Information
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 Fixed Analog Gain
      2. 10.3.2 SD Operation
      3. 10.3.3 PLIMIT
      4. 10.3.4 Spread Spectrum and De-Phase Control
      5. 10.3.5 GVDD Supply
      6. 10.3.6 DC Detect
      7. 10.3.7 PBTL Select
      8. 10.3.8 Short-Circuit Protection and Automatic Recovery Feature
      9. 10.3.9 Thermal Protection
    4. 10.4 Device Functional Modes
  11. 11Application and Implementation
    1. 11.1 Application Information
    2. 11.2 Typical Applications
      1. 11.2.1 Design Requirements
        1. 11.2.1.1 PCB Material Recommendation
        2. 11.2.1.2 PVCC Capacitor Recommendation
        3. 11.2.1.3 Decoupling Capacitor Recommendations
      2. 11.2.2 Detailed Design Procedure
        1. 11.2.2.1 Ferrite Bead Filter Considerations
        2. 11.2.2.2 Efficiency: LC Filter Required with the Traditional Class-D Modulation Scheme
        3. 11.2.2.3 When to Use an Output Filter for EMI Suppression
        4. 11.2.2.4 Input Resistance
        5. 11.2.2.5 Input Capacitor, Ci
        6. 11.2.2.6 BSN and BSP Capacitors
        7. 11.2.2.7 Differential Inputs
        8. 11.2.2.8 Using Low-ESR Capacitors
      3. 11.2.3 Application Performance Curves
        1. 11.2.3.1 EN55013 Radiated Emissions Results
        2. 11.2.3.2 EN55022 Conducted Emissions Results
  12. 12Power Supply Recommendations
    1. 12.1 Power Supply Decoupling, CS
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14デバイスおよびドキュメントのサポート
    1. 14.1 デバイス・サポート
      1. 14.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 14.2 ドキュメントのサポート
      1. 14.2.1 関連資料
    3. 14.3 関連リンク
    4. 14.4 ドキュメントの更新通知を受け取る方法
    5. 14.5 サポート・リソース
    6. 14.6 商標
    7. 14.7 静電気放電に関する注意事項
    8. 14.8 Glossary
  15. 15メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

10.3.3 PLIMIT

The PLIMIT operation will, if selected, limit the output voltage level to a voltage level below the supply rail. In this case, the amplifier operates as if it was powered by a lower supply voltage, and thereby limiting the output power by voltage clipping. PLIMIT threshold is set by the PLIMIT pin voltage.

TPA3136D2 TPA3136AD2 Plimit.gifFigure 16. PLIMIT Circuit Operation

The PLIMIT circuit sets a limit on the output peak-to-peak voltage. The limiting is done by limiting the duty cycle to a fixed maximum value. The limit can be thought of as a "virtual" voltage rail which is lower than the supply connected to PVCC. The "virtual" rail is approximately four times the voltage at the PLIMIT pin. The output voltage can be used to calculate the maximum output power for a given maximum input voltage and speaker impedance.

Equation 1. TPA3136D2 TPA3136AD2 EQ1_Pout_los708.gif

where

  • POUT (10%THD) = 1.25 × POUT (unclipped)
  • RL is the load resistance.
  • RS is the total series resistance including RDS(on), and output filter resistance.
  • VP is the peak amplitude, which is limited by "virtual" voltage rail.