SLUUBH5A November   2016  – February 2022 TPS546C23

 

  1.   Trademarks
  2. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Typical Applications
    3. 1.3 Features
  3. 2 Electrical Performance Specifications
  4. 3 Schematic
  5. 4 Test Setup
    1. 4.1 Test and Configuration Software
      1. 4.1.1 Description
      2. 4.1.2 Features
    2. 4.2 Test Equipment
      1. 4.2.1 Voltage Source
      2. 4.2.2 Multimeters
      3. 4.2.3 Output Load
      4. 4.2.4 Oscilloscope
      5. 4.2.5 Fan
      6. 4.2.6 USB-to-GPIO Interface Adapter
      7. 4.2.7 Recommended Wire Gauge
    3. 4.3 Recommended Test Setup
    4. 4.4 List of Test Points, Jumpers and Connectors
  6. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  7. 6 Test Procedure
    1. 6.1 Line and Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Control Loop Gain and Phase Measurement Procedure
    3. 6.3 Efficiency Measurement
  8. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  Efficiency
    2. 7.2  Load Regulation
    3. 7.3  Line Regulation
    4. 7.4  Transient Response
    5. 7.5  Output Ripple
    6. 7.6  Control On
    7. 7.7  Control Off
    8. 7.8  Current Sharing Between Two Phases
    9. 7.9  Control Loop Bode Plot
    10. 7.10 Thermal Image
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 Bill of Materials
  11. 10Screenshots
    1. 10.1 Fusion GUI Screenshots
  12. 11Revision History

6.2 Control Loop Gain and Phase Measurement Procedure

The TPS546C23EVM2-746 includes a 49.9-Ω series resistor in the feedback loop for VOUT. The resistor is accessible at the test points TP14 and TP15 for loop response analysis. These test points should be used during loop response measurements as the perturbation injecting points for the loop. See the description in Table 6-1.

Table 6-1 List of Test Points for Loop Response Measurements
Test PointNode NameDescriptionComment
TP14CHA1Input to feedback divider of VOUTThe amplitude of the perturbation at this node should be limited to less than 30 mV.
TP15CHB1Resulting output of VOUTBode can be measured by a network analyzer with a CH-B/CH-A configuration.

Measure only one output at a time with the following procedure:

  1. Set up the EVM as described in Figure 4-1.
  2. For VOUT, connect the isolation transformer of the network analyzer from TP14 to TP15.
  3. Connect the input signal measurement probe to TP14. Connect the output signal measurement probe to TP15.
  4. Connect the ground leads of both probe channels to TP11.
  5. On the network analyzer, measure the Bode as TP15/TP14 (Out/In).