SLUU297B December   2007  – January 2022 TPS40195

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Applications
    2. 2.2 Features
  4. 3 TPS40195EVM Electrical Performance Specifications
  5. 4 Schematic
    1. 4.1 Test Points
  6. 5 Test Setup
    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 Signal Generator
      6. 5.1.6 Recommended Wire Gauge
      7. 5.1.7 Other
    2. 5.2 Equipment Setup
  7. 6 Test Procedure
    1. 6.1 Line and Load Regulation
    2. 6.2 Output Ripple Measurement (TP5, TP13)
    3. 6.3 Loop Analysis (TP7, TP8, TP10)
    4. 6.4 Disable (TP11) and Power Good (TP9)
    5. 6.5 Switch Node (TP4) and SYNC (TP12)
    6. 6.6 Equipment Shutdown
  8. 7 TPS40195EVM Typical Performance Data and Characteristic Curves
    1. 7.1 Line and Load Regulation
    2. 7.2 Efficiency
    3. 7.3 Output Voltage Ripple
    4. 7.4 Transient Response
    5. 7.5 Bode Plots
    6. 7.6 Test Point Waveforms
  9. 8 EVM Assembly Drawings and Layout
  10. 9 List of Materials
  11. 10Revision History

6.5 Switch Node (TP4) and SYNC (TP12)

  1. Set up the EVM as described in Section 5.2 and Figure 5-1.
  2. Use the oscilloscope to monitor TP4. Set the oscilloscope to the following:
    • 1-MΩ input impedance
    • 20-MHz Bandwidth
    • AC coupling
    • 1-μs/div horizontal resolution
    • 5-V/div vertical resolution
  3. Increase VIN to 12 V.
  4. Set LOAD1 to 10 A.
  5. Vary LOAD1 and observe the oscilloscope.
  6. Vary VIN and observe the oscilloscope.
  7. Set the signal generator to 360 kHz and pulse shape per Figure 6-1.
  8. Connect the signal generator to TP12.
  9. Monitor TP12 and TP4 with the oscilloscope.
  10. Vary signal generator frequency from 360 kHz to 400 kHz.
  11. See Section 6.6 for equipment shutdown.
GUID-17433230-7E6B-45E3-A20E-9299100BD799-low.gifFigure 6-3 Typical TPS40195EVM SYNC Signal. The TPS40195 Synchronizes on the Falling Edge.