SLVU446B March   2011  – July 2021 TPS56221

 

  1. 1 Introduction
  2. 2 Description
    1. 2.1 Applications
    2. 2.2 Features
  3. 3 Electrical Performance Specifications
  4. 4 Schematic
  5. 5 Test Setup
    1. 5.1 Test Equipment
      1. 5.1.1 Voltage Source
      2. 5.1.2 Meters
      3. 5.1.3 Load
      4. 5.1.4 Oscilloscope
      5. 5.1.5 Fan
    2. 5.2 Recommended Wire Gauge
      1. 5.2.1 VIN to J1
      2. 5.2.2 J2 to LOAD
    3. 5.3 Equipment Set Up Procedure
  6. 6 Configurations
    1. 6.1 Enable Selection (J3)
  7. 7 Test Point Descriptions
    1. 7.1 Input Voltage Monitoring (TP1 and TP2)
    2. 7.2 Output Voltage Monitoring (TP3 and TP4)
    3. 7.3 Enable/Soft-start Monitoring (TP5)
    4. 7.4 Power Good Monitoring (TP6)
    5. 7.5 Loop Response Testing (TP7, TP8, TP9 and TP10)
    6. 7.6 Switch Node Voltage Monitoring (TP11 and TP12)
  8. 8 Test Procedures
    1. 8.1 Start Up/Shut Down Procedure
    2. 8.2 Output Ripple Voltage Measurement Procedure
    3. 8.3 Control Loop Gain and Phase Measurement Procedure
    4. 8.4 Equipment Shutdown
  9. 9 Performance Data and Typical Characteristic Curves
    1. 9.1  Efficiency
    2. 9.2  Load Regulation
    3. 9.3  Line Regulation
    4. 9.4  Output Voltage Ripple
    5. 9.5  Switch Node
    6. 9.6  Load Transient
    7. 9.7  Start Up
    8. 9.8  Power Off
    9. 9.9  Over-Current Protection
    10. 9.10 Control Loop Bode Plot
    11. 9.11 Thermal Image
  10. 10EVM Assembly Drawings and PCB Layout
  11. 11List of Materials
  12. 12Revision History

7.6 Switch Node Voltage Monitoring (TP11 and TP12)

TPS56221EVM-579 provides two test points for measuring the switch node. To monitor the switch node voltage, set oscilloscope per Oscilloscope For Switching Waveforms in Section 5.1.4. Connect the oscilloscope probe to TP11 and the ground lead of the probe to TP12. To monitor the voltage spike on switch node, please remove the bandwidth limit on the oscilloscope and refer to the Application Report SLPA005 (Reducing Ringing Through PCB Layout Techniques) for the measurement techniques.