ZHCSRR9J december   2003  – august 2023 TPS2061 , TPS2062 , TPS2063 , TPS2065 , TPS2066 , TPS2067

PRODMIX  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 说明（续）
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Dissipating Rating Table
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Electrical Characteristics
    5. 7.5 Typical Characteristics(All Devices Excluding TPS2065DBV)
    6. 7.6 Typical Characteristics (TPS2065DBV)
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1  Functional Block Diagram
    2. 9.2  Power Switch
    3. 9.3  Charge Pump
    4. 9.4  Driver
    5. 9.5  Enable ( ENx or ENx)
    6. 9.6  Current Sense
    7. 9.7  Overcurrent
      1. 9.7.1 Overcurrent Conditions (All Devices Excluding TPS2065DBV)
      2. 9.7.2 Overcurrent Conditions (TPS2065DBV)
    8. 9.8  Overcurrent ( OCx)
    9. 9.9  Thermal Sense
    10. 9.10 Undervoltage Lockout
  11. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1  Power-supply Considerations
      2. 10.1.2  OC Response
      3. 10.1.3  Power Dissipation and Junction Temperature
      4. 10.1.4  Thermal Protection
      5. 10.1.5  Undervoltage Lockout (UVLO)
      6. 10.1.6  Universal Serial Bus (USB) Applications
      7. 10.1.7  Host/Self-Powered and Bus-powered Hubs
      8. 10.1.8  Low-power Bus-powered and High-Power Bus-Powered Functions
      9. 10.1.9  USB Power-distribution Requirements
      10. 10.1.10 Generic Hot-Plug Applications
  12. 11Device and Documentation Support
    1. 11.1 Device Support
    2. 11.2 Documentation Support
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 静电放电警告
    7. 11.7 术语表
  13. 12Mechanical, Packaging, and Orderable Information

10.1.9 USB Power-distribution Requirements

USB can be implemented in several ways, and, regardless of the type of USB device being developed, several power-distribution features must be implemented.

  • Hosts/SPHs must:
    • Current-limit downstream ports
    • Report overcurrent conditions on USB VBUS
  • BPHs must:
    • Enable/disable power to downstream ports
    • Power up at <100 mA
    • Limit inrush current (<44 Ω and 10 μF)
  • Functions must:
    • Limit inrush currents
    • Power up at <100 mA

The feature set of the TPS206x allows them to meet each of these requirements. The integrated current-limiting and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable and controlled rise times meet the need of both input and output ports on bus-powered hubs, as well as the input ports for bus-powered functions (see Figure 10-5).

GUID-549F2990-4B2D-4278-8A3D-2710439D7A6A-low.gifFigure 10-5 Hybrid Self / Bus-Powered Hub Implementation