ZHCSQV7A march   2023  – august 2023 TPS2117

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Functional Modes
      1. 7.3.1 Priority and Manual Mode
        1. 7.3.1.1 Priority Switching
        2. 7.3.1.2 Manual Switching
      2. 7.3.2 Diode Mode
    4. 7.4 Feature Description
      1. 7.4.1 Truth Table
      2. 7.4.2 Soft Start
      3. 7.4.3 Status Indication
      4. 7.4.4 Reverse Current Blocking
    5. 7.5 VINx Collapse Rate
    6. 7.6 Fast Switchover Behavior
    7. 7.7 Output Voltage Drop
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 接收文档更新通知
    3. 9.3 Trademarks
    4. 9.4 静电放电警告
    5. 9.5 术语表
  11. 10Mechanical, Packaging, and Orderable Information

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7.3.1 Priority and Manual Mode

When MODE is tied high, PR1 determines the channel selected. To configure VIN1 as the priority supply, connect MODE to VIN1 and set the proper threshold through a resistor divider from VIN1 to PR1. To configure manual selection, pull up MODE to an external supply and follow the truth table (Table 7-1). When PR1 is pulled above VREF, the voltage on VIN1 is used to power the output, and when it is pulled below VREF, VIN2 is used to power the output. The expected behavior for the device is shown in Figure 7-1.

GUID-34778652-6FAB-4C46-BD07-85E2CB6C8E0F-low.jpg Figure 7-1 Priority and Manual Mode Switching

When PR1 is toggled, the device implements a break-before-make switchover which shuts off both channels before turning on the new channel to power the output. This means that for time tSW, the output is unpowered and will dip depending on the load current and output capacitance. If the output voltage is greater than the input supply being switched to, then the device will not turn on the new channel until the output has discharged down to VIN + VRCB to prevent reverse current flow.

When MODE is pulled low and PR1 is pulled high, the device enters shutdown. Both channels are turned off and the output is high impedance. When the PR1 pin is pulled low, the higher voltage supply between VIN1 and VIN2 is passed to the output.