ZHCSRR9K December 2003 – June 2024 TPS2061 , TPS2062 , TPS2063 , TPS2065 , TPS2066 , TPS2067
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 说明（续）
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
- 8 Detailed Description
-
9 Application and Implementation
- 9.1
Application Information
- 9.1.1 Power-supply Considerations
- 9.1.2 OC Response
- 9.1.3 Power Dissipation and Junction Temperature
- 9.1.4 Thermal Protection
- 9.1.5 Undervoltage Lockout (UVLO)
- 9.1.6 Universal Serial Bus (USB) Applications
- 9.1.7 Host/Self-Powered and Bus-powered Hubs
- 9.1.8 Low-power Bus-powered and High-Power Bus-Powered Functions
- 9.1.9 USB Power-distribution Requirements
- 9.1.10 Generic Hot-Plug Applications
- 9.1
Application Information
- 10Device and Documentation Support
- 11Revision History
- 12Mechanical, Packaging, and Orderable Information
9.1.9 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 9-5).
Figure 9-5 Hybrid Self / Bus-Powered Hub Implementation