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

6.2 Output Ripple Measurement (TP5, TP13)

  1. Set up the EVM as described in Section 5.2 and Figure 5-1.
  2. Set the oscilloscope to the following:
    • 1-MΩ input impedance
    • 20-MHz Bandwidth
    • AC coupling
    • 1-μs/div horizontal resolution
    • 10-mV/div vertical resolution
  3. Place the oscilloscope probe tip through TP5 and hold the ground barrel to TP13 as shown in Figure 6-1. For a hands free approach, the loop in TP13 can be cut and opened to cradle the probe barrel. V2 can have to be removed from these test points to allow the oscilloscope to be connected.
  4. Increase VIN to 8 V.
  5. Vary LOAD1 from 0 A to 20 A and observe the oscilloscope waveform.
  6. Repeat step 5 for various VIN values up to 20 V.
  7. See Section 6.6 for equipment shutdown.

See Section 7.3 for typical ripple voltage results

GUID-19786A41-8B48-424B-9548-0F2A05186F9F-low.gifFigure 6-1 Output Ripple Measurement - Tip and Barrel Using TP5 and TP13