JAJSP20 November   2024 TPD4S480

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings—IEC Specification
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins or CC1, CC2, DP, DM Pins): 63-VDC Tolerant
      2. 6.3.2 CC1, CC2 Overvoltage Protection FETs 600-mA Capable for Passing VCONN Power
      3. 6.3.3 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices
      4. 6.3.4 EPR Adapter
        1. 6.3.4.1 VBUS Divider
        2. 6.3.4.2 EPR Blocking FET Gate Driver
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 EPR Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 VBIAS Capacitor Selection
        2. 7.2.2.2 Dead Battery Operation
        3. 7.2.2.3 CC Line Capacitance
        4. 7.2.2.4 Additional ESD Protection on CC and SBU Lines
        5. 7.2.2.5 FLT Pin Operation
        6. 7.2.2.6 How to Connect Unused Pins
      3. 7.2.3 EPR Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
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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

7.2.2.1 VBIAS Capacitor Selection

As noted in the Section 5.3 table, a minimum of 63VBUS rated capacitor is required for the VBIAS pin, and a 100VBUS capacitor is recommended. The VBIAS capacitor is in parallel with the central diode clamp integrated inside the TPD4S480. A forward biased hiding diode connects the VBIAS pin to the C_CCx and C_SBUx pins. Therefore, when a Short-to-VBUS event occurs at 48V, 48VBUS minus a forward biased diode drop is exposed to the VBIAS pin. Additionally, during the short-to-VBUS event, ringing can occur almost double the settling voltage of 48V, allowing a potential 96V to be exposed to the C_CCx and C_SBUx pins. However, the internal diode clamps limit the voltage exposed to the C_CCx and C_SBUx pins to around 63V. Therefore, at least 63V capacitor is required to insure the VBIAS capacitor does not get destroyed during Short-to-VBUS events.

A 100V, X7R capacitor is recommended to further improve the derating performance of the capacitors. When the voltage across a real capacitor is increased, the capacitance value derates. The more the capacitor derates, the larger the ringing in the short-to-VBUS RLC circuit. The 100V X7R capacitors have great derating performance, allowing for the best short-to-VBUS performance of the TPD4S480.