SLUU232A September   2005  – January 2022 TPS40190

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Description
    2. 1.2 Applications
    3. 1.3 Features
  3. 2TPS40190EVM-001 Electrical Performance Specifications
  4. 3Schematic
    1. 3.1 Adjusting Output Voltage (R1)
    2. 3.2 Adjusting Short Circuit Protection (R6)
    3. 3.3 Disable (TP1 and SW1)
  5. 4Test Setup
    1. 4.1 Equipment
      1. 4.1.1 Voltage Source (V12V_IN)
      2. 4.1.2 Meters
      3. 4.1.3 Loads (LOAD1)
      4. 4.1.4 Oscilloscope
      5. 4.1.5 Recommended Wire Gauge
      6. 4.1.6 Other
    2. 4.2 Equipment Setup
      1. 4.2.1 Procedure
      2. 4.2.2 Diagram
    3. 4.3 Start-Up/Shutdown Procedure
    4. 4.4 Control Loop Gain and Phase Measurement Procedure
    5. 4.5 Equipment Shutdown
  6. 5TPS40190EVM Typical Performance Data and Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Line and Load Regulation
  7. 6EVM Assembly Drawings and Layout
  8. 7List of Materials
  9. 8Revision History

4.1.4 Oscilloscope

A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. The oscilloscope should be set for the following to take output ripple measurements:

  • 1-MW impedance
  • 20-MHz bandwidth
  • AC coupling
  • 1-ms/division horizontal resolution
  • 20-mV/division vertical resolution

TP 9 and TP 10 can be used to measure the output ripple voltage by placing the oscilloscope probe tip through TP 9 and holding the ground barrel to TP 10 as shown in Figure 4-1. For a hands-free approach, the loop in TP 10 can be cut and opened to cradle the probe barrel. Using a leaded ground connection may induce additional noise due to the large ground loop area.