SLVU179B October   2006  – February 2022 TPS51117

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Description
    2. 1.2 Features
    3. 1.3 Operating Specification
    4. 1.4 Schematic
  3. 2Test Setup
    1. 2.1 Test Equipment
    2. 2.2 Test Points
    3. 2.3 Recommended Test Setup
    4. 2.4 Standard Test Procedures
      1. 2.4.1 Line/Load Regulation
      2. 2.4.2 Output Ripple Measurement
  4. 3Performance Data and Typical Characteristic Curves
  5. 4Board Layout Using TPS51117RGY (QFN 14)
  6. 5List of Materials
  7. 6Revision History

2.4.2 Output Ripple Measurement

  1. Ensure the load is set to constant current mode and set to 0 ADC.
  2. Make sure the switch SW 1 is in the “OFF” position.
  3. Turn on VBAT supply, increase to 12 V, and use DMM1 to measure the voltage.
  4. Turn on the 5.0-V bias supply, increase to 5 V, and use DMM2 to measure the voltage.
  5. Set the load to 10 ADC.
  6. Attach an oscilloscope probe to TP16 and ground to TP15.
  7. Set the oscilloscope as follows:
    1. Horizontal sweep: 2 μs/div
    2. Trigger mode: auto, falling edge
    3. Channel should be set to AC coupled, bandwidth 20 Mhz

    Measurement should be similar to Figure 3-5.

    GUID-A98EAE1C-50A5-4C2F-BA2F-8499D4B25769-low.gifFigure 2-2 Tip and Barrel Measurement for VOUT Ripple