SLUUD38A June   2024  – July 2025 TPSM82866A , TPSM82866C

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Safety Instructions
    2. 2.2 Header Information
    3. 2.3 Jumper Information
    4. 2.4 Interfaces
    5. 2.5 Test Points
  7. 3Software
  8. 4Implementation Results
    1. 4.1 Evaluation Setup
      1. 4.1.1 VSET/VID Resistor (TPSM82866CAxPEVM Only)
      2. 4.1.2 VSET/MODE Resistor (TPSM82866AA0PEVM Only)
      3. 4.1.3 Input and Output Capacitors
      4. 4.1.4 Feedforward Capacitor
      5. 4.1.5 Loop Response Measurement
    2. 4.2 Performance Data and Results
  9. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials (BOM)
  10. 6Additional Information
    1. 6.1 Revision A EVMs
      1. 6.1.1 Rev A. Schematic
      2. 6.1.2 Rev. A Bill of Materials (BOM)
      3. 6.1.3 Rev. A PCB Layout
      4. 6.1.4 Rev. A Loop Response
    2. 6.2 Trademarks
  11. 7Revision History

4.1.5 Loop Response Measurement

The loop response can be measured with simple changes to the circuitry. First, install a 10Ω resistor across the pads of R6 on the back of the PCB. The pads are spaced to allow installation of an 0603-sized resistor. Next, cut the short section of trace on the top layer between C5 and C6 to separate the via on VOUT from the plane. Figure 4-1 shows this cut. With these changes, an AC signal (10mV, peak-to-peak amplitude recommended) can be injected into the control loop across the added 10Ω resistor. Figure 4-4 and Figure 4-5 show the results of this test.

TPSM82866AA0PEVM, TPSM82866CA1PEVM, TPSM82866CA2PEVM, TPSM82866CA3PEVM Loop Response Measurement ModificationFigure 4-1 Loop Response Measurement Modification