SLUU406A February   2010  – January 2022 CSD16322Q5 , CSD16410Q5A , TPS40303 , TPS40304 , TPS40305

 

  1.   Trademarks
  2. 1Description
    1. 1.1 Applications
    2. 1.2 Features
  3. 2TPS40305EVM-488 Electrical Performance Specifications
  4. 3TPS40305EVM-488 Schematic
  5. 4Connector and Test Point Descriptions
    1. 4.1 Enable Jumper (JP2)
    2. 4.2 Frequency Spread Spectrum – FSS Jumper (JP1)
    3. 4.3 Test Point Descriptions
      1. 4.3.1 Input Voltage Monitoring (TP1 and TP2)
      2. 4.3.2 Output Voltage Monitoring (TP3 and TP4)
      3. 4.3.3 Loop Response Testing (TP5, TP6, TP7, TP8, and R3)
      4. 4.3.4 Error Amplifier Voltage Monitoring (TP9, TP10, and TP11)
      5. 4.3.5 Switching Waveform Monitoring (TP12, TP13, TP14, and TP15)
      6. 4.3.6 Power-Good Voltage Monitoring (TP16 and TP18)
      7. 4.3.7 Enable and Soft-Start Voltage Monitoring (TP17 and TP18)
  6. 5Test Set Up
    1. 5.1 Equipment
      1. 5.1.1 Voltage Source
      2. 5.1.2 Meters
      3. 5.1.3 Loads
      4. 5.1.4 Oscilloscope
      5. 5.1.5 Recommended Wire Gauge
      6. 5.1.6 Other
    2. 5.2 Equipment Setup
      1. 5.2.1 Procedure
      2. 5.2.2 Diagram
    3. 5.3 Start-Up/Shutdown Procedure
    4. 5.4 Output Ripple Voltage Measurement Procedure
    5. 5.5 Control Loop Gain and Phase Measurement Procedure
    6. 5.6 Equipment Shutdown
  7. 6TPS40305EVM-488 Test Data
    1. 6.1 Efficiency
    2. 6.2 Line and Load Regulation
    3. 6.3 Output Voltage Ripple
    4. 6.4 Switch Node
    5. 6.5 Control Loop Bode Diagram
    6. 6.6 Additional Waveforms
      1. 6.6.1 Output Ripple with Frequency Spread Spectrum (FSS) Enabled
  8. 7TPS40305EVM-488 Assembly Drawings and Layout
  9. 8TPS40305EVM-488 Bill of Materials
  10. 9Revision History

4.3.5 Switching Waveform Monitoring (TP12, TP13, TP14, and TP15)

The TPS40305EVM-488 provides three test points and a local power ground for measuring the switching waveforms of the module power stage. This allows the user to monitor actual switching waveforms during operation. TP15 is a 0.040" square pad of exposed PCB copper to minimize EMI radiation from the high transient voltages on the switch node. Switching waveform measurements should be made using power ground (TP14) as the ground reference for more accurate measurements.