SLVU641A January   2012  – 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

2.3 Equipment Interconnect

  • Turn off the input power supply after verifying that its output voltage is set to the desired supply voltage (less than 17 V) and the current limit is set to approximately 500 mA. Connect the positive voltage lead from the input power supply to J3 (VIN) and the ground lead to J4 (GND).
  • Connect a 0-A to 1-A load (ILoad) between LDO OUT and GND using J1 and J2.
  • Disable the output of the LDO by connecting a shorting jumper at JP1 from the “off” pin to the center pin (LDO EN).