SLVUCB0A September   2021  – November 2022 TPSM82864A , TPSM82866A

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Performance Specification
    2. 1.2 Modifications
      1. 1.2.1 Input and Output Capacitors
      2. 1.2.2 Feedforward Capacitor
      3. 1.2.3 VSET/MODE Resistor
      4. 1.2.4 Loop Response Measurement
  4. 2Setup
    1. 2.1 Setup
    2. 2.2 Input, Output Connector and Jumper Descriptions
  5. 3Safety Instructions
  6. 4Test Results
  7. 5Board Layout
  8. 6Schematic and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
  9. 7Revision History

1.2.4 Loop Response Measurement

The loop response can be measured with simple changes to the circuitry. First, install a 10-Ω 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 the via near R1 and the VOUT plane. Figure 1-1 shows this change. With these changes, an AC signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control loop across the added 10-Ω resistor. Figure 4-3 shows the results of this test.

GUID-20210901-SS0I-K28H-BVMV-WQMWJWCSFGLB-low.pngFigure 1-1 Loop Response Measurement Modification