TIDUE18 November   2022 TPS51215A

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 DCR current sense
      2. 2.2.2 Subtract and Amplify
      3. 2.2.3 Active Voltage Scale
      4. 2.2.4 IMON Output
    3. 2.3 Highlighted Products
    4. 2.4 System Design Theory
      1. 2.4.1 DCR Current Sense
      2. 2.4.2 Subtract and Amplify
      3. 2.4.3 Active Voltage Scale
      4. 2.4.4 IMON Output
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Start-up
      2. 3.3.2 VID Change
      3. 3.3.3 Load Transient
      4. 3.3.4 Load-Line Test
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  10. 5About the Authors

2.2.1 DCR current sense

Load line control will get the output voltage decreased with the increasing output current linearly, while the IMON feature needs to have a voltage output proportional to output current. The output current needs to be sensed for both of the two features. An inductor DCR current sense is implemented in the proposed method. Compared with current sense with sensing resistor, additional cost can be saved. Two stage RC filter is used to filter the inductor current ripple and get the DC output current information.