SLUUCQ1 March   2023 TPS546D24S

 

  1.   Stacking TPS546D24S Two-Phase Evaluation Module
  2.   Trademarks
  3. 1 Description
    1. 1.1 Before You Begin
    2. 1.2 Typical Applications
    3. 1.3 Features
  4. 2 Electrical Performance Specifications
  5. 3 Schematic
  6. 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 Tip and Barrel Measurement
    4. 4.4 List of Test Points, Jumpers, and Connectors
    5. 4.5 Evaluating Single Phase Operation
    6. 4.6 Evaluating Split Rail Input
    7. 4.7 Configuring EVM to Overdrive VDD5
  7. 5 EVM Configuration Using the Fusion GUI
    1. 5.1 Configuration Procedure
  8. 6 Test Procedure
    1. 6.1 Line and Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Efficiency Measurement Test Points
    3. 6.3 Control Loop Gain and Phase Measurement Procedure
  9. 7 Performance Data and Typical Characteristic Curves
    1. 7.1  Efficiency
    2. 7.2  Load and Line Regulation (Measured Between TP22 and TP25)
    3. 7.3  Transient Response
    4. 7.4  Control Loop Bode Plot
    5. 7.5  Output Ripple
    6. 7.6  Power MOSFET Drain-Source Voltage
    7. 7.7  Control On
    8. 7.8  Control Off
    9. 7.9  Control On With Pre-biased Output
    10. 7.10 Current Sharing Between Two Phases
    11. 7.11 Thermal Image
  10. 8 EVM Assembly Drawing and PCB Layout
  11. 9 Bill of Materials
  12. 10Using the Fusion GUI
    1. 10.1  Opening the Fusion GUI
    2. 10.2  General Settings
    3. 10.3  Changing ON_OFF_CONFIG
    4. 10.4  Pop-up for Some Commands While Conversion is Enabled
    5. 10.5  SMBALERT# Mask
    6. 10.6  Device Info
    7. 10.7  Phase Commands
    8. 10.8  All Config
    9. 10.9  Pin Strapping
    10. 10.10 Monitor
    11. 10.11 Status

6.3 Control Loop Gain and Phase Measurement Procedure

The TPS546D24SEVM-2PH includes a 49.9-Ω series resistor in the feedback loop for VOUT. The resistor is accessible at the test points TP17 and TP18 for loop response analysis. These test points must be used during loop response measurements as the perturbation injecting points for the loop . See the description in Table 6-3.

Table 6-3 List of Test Points for Loop Response Measurements
Test PointNode NameDescriptionComment
TP18CH_BInput to feedback divider of VOUTThe amplitude of the perturbation at this node must be limited to less than 30 mV
TP17CH_AResulting output of VOUTBode can be measured by a network analyzer with a CH_B/CH_A configuration

Measure the loop response with the following procedure:

  1. Set up the EVM as described in Section 4.2.
  2. For VOUT, connect the isolation transformer of the network analyzer from TP18 to TP17.
  3. Connect the input signal measurement probe to TP18. Connect the output signal measurement probe to TP17.
  4. Connect the ground leads of both probe channels to TP20.
  5. On the network analyzer, measure the Bode as TP18/TP17 (In/Out).