SLVU437B October   2011  – June 2021 TPS62130 , TPS62131 , TPS62132 , TPS62133 , TPS62140 , TPS62141 , TPS62142 , TPS62143 , TPS62150 , TPS62151 , TPS62152 , TPS62153

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification
    3. 1.3 Modifications
      1. 1.3.1 Fixed Output Operation
      2. 1.3.2 Input and Output Capacitors
      3. 1.3.3 Soft-Start Time
      4. 1.3.4 Loop Response Measurement
  3. 2Setup
    1. 2.1 Input/Output Connector Descriptions
    2. 2.2 Setup
  4. 3TPS621x0EVM-505 Test Results
  5. 4Board Layout
  6. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials
  7. 6Revision History

1.3.4 Loop Response Measurement

The loop response of the TPS621x0EVM-505 can be measured with two simple changes to the circuitry. First, install a 10-Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to allow installation of 0805- or 0603-sized resistors. Second, cut the trace between the via on the output voltage and the trace that connects to the VOS pin via. These changes are shown in Figure 1-1. With these changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control loop across the added resistor.

GUID-FC6376E6-D704-4445-9374-06EC42157C71-low.gifFigure 1-1 Loop Response Measurement Modification