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

8.2 Output Ripple Voltage Measurement Procedure

  1. Follow Section 8.1 to set VIN and LOAD to desired operating condition.
  2. Set oscilloscope for Output Voltage Ripple Measurement in Section 5.1.4.
  3. Connect oscilloscope probe with exposed metal barrel to TP3 and TP4 per Figure 8-1. Using a leaded ground connection may induce additional noise due to the large ground loop.
  4. Follow Section 8.1 to power down.
GUID-7D7D75C0-6427-4EA0-91DF-7BA1D3BBA76E-low.gifFigure 8-1 Tip and Barrel Output Voltage Ripple Measurement