SLVU641A January   2012  β€“ November 2021 TPS54120

 

  1.   Trademarks
  2. 1Background
  3. 2Setup
    1. 2.1 Input and Output Connections and Jumper Descriptions
    2. 2.2 Modifications
      1. 2.2.1 SW Output Voltage Setpoint
      2. 2.2.2 LDO Output Voltage Setpoint
      3. 2.2.3 Switcher Slow-Start Time
      4. 2.2.4 LDO Start-Up
    3. 2.3 Equipment Interconnect
  4. 3Operation
  5. 4Test Results
    1. 4.1 Output Voltage Ripple
    2. 4.2 Output Noise
    3. 4.3 Output Turn-On
    4. 4.4 Load Transient
    5. 4.5 Efficiency
    6. 4.6 Thermal Characteristic
  6. 5Board Layout
    1. 5.1 Layout Description
  7. 6Schematic
  8. 7Bill of Materials
  9. 8Revision History

3 Operation

  • Turn on the input power supply. Verify that the switcher output voltage is near 4.1 V and the LDO output is near 0 V.
  • Enable the LDO output by connecting the jumper on JP1 from the β€œon” pin to the center pin (LDO EN).
  • Verify that the LDO output voltage is 3.3 V.
  • Vary the load current and VIN voltage as necessary for test purposes.