ZHCSLP7C December   2019  – February 2021 TPD4S311 , TPD4S311A

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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—JEDEC Specification
    3. 7.3 ESD Ratings—IEC Specification
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Electrical Characteristics
    7. 7.7 Timing Requirements
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins ): 24-VDC Tolerant
      2. 8.3.2 4-Channels of IEC 61000-4-2 ESD Protection (CC1, CC2, SBU1, SBU2 Pins)
      3. 8.3.3 CC1, CC2 Overvoltage Protection FETs 400-mA or 600-mA Capable for Passing VCONN Power
      4. 8.3.4 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices
      5. 8.3.5 1.69-mm × 1.69-mm DSBGA Package
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 VBIAS Capacitor Selection
        2. 9.2.2.2 Dead Battery Operation
        3. 9.2.2.3 CC Line Capacitance
        4. 9.2.2.4 Additional ESD Protection on CC and SBU Lines
        5. 9.2.2.5 FLT Pin Operation
        6. 9.2.2.6 How to Connect Unused Pins
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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9.2.2.3 CC Line Capacitance

USB PD has a specification for the total amount of capacitance that is required for proper USB PD BMC operation on the CC lines. The specification from section 5.8.6 of the USB PD Specification is given below in Table 9-3.

Table 9-3 USB PD cReceiver Specification
NAMEDESCRIPTIONMINMAXUNITCOMMENT
cReceiverCC receiver capacitance200600pFThe DFP or UFP system shall have capacitance within this range when not transmitting on the line

Therefore, the capacitance on the CC lines must stay in between 200 pF and 600 pF when USB PD is being used. Therefore, the combination of capacitances added to the system by the TPS65982, the TPD4S311, and any external capacitor must fall within these limits. Table 9-4 shows the analysis involved in choosing the correct external CC capacitor for this system, and shows that an external CC capacitor is required.

Table 9-4 CC Line Capacitor Calculation
CC CAPACITANCEMINMAXUNITCOMMENT
CC line target capacitance200600pFFrom the USB PD Specification section
TPS65982 capacitance70120pFFrom the TPS65982 data sheet
TPD4S311 capacitance45120pFFrom the Electrical Characteristics table
Proposed capacitor GRM033R71E221KA01D110330pFCAP, CERM, 220 pF, 25 V, ±10%, X7R, 0201 (for min and max, assume ±50% capacitance change with temperature and voltage derating to be overly conservative)
TPS65982 + TPD4S311 + GRM033R71E221KA01D225570pFMeets USB PD cReceiver specification
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