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

2.2.4 IMON Output

IMON output is needed by IMVP multiphase VR controller. IMVP controller has related pins for the input and they should be connected with the IMON output from VCCIN_AUX solution.

Currently, there are two major types of IMON output signal, which is determined by the used IMVP VR controller:

  • The first type of IMON output is inductor DCR current sensing signal. For this type of IMON, the IMVP VR controller has two pins for differential IMON input. The solution proposed in this reference design is compatible with this type of IMVP VR controller. The differential voltage signals on Cfilter1 in Figure 2-1 are the IMON output and could be directly connected with VR controller.
  • The second type of IMON output is a single-ended voltage proportional to inductor average current and referenced to ground. The solution proposed in this reference design is not compatible with this type of IMVP controller.

The schematic design is shown as Figure 2-2.

GUID-20220503-SS0I-MWLR-P1ZM-VQLJPKFHRZJD-low.gif Figure 2-2 TPS51215A Power Solution with Load Line Feature Schematic

Figure 2-2 is the major page of schematic in this reference design, which only includes the circuits around voltage regulator. The symbol for test tool interposer and the output capacitors placed at loading side (interposer side) are not shown here.

The complete schematics of the reference design are at TIDA-050057.

The principle for implementation will be introduced in Section 2.4.