SLVUB76A July   2017  – October 2021 TPS54335A

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Set Point
      2. 1.3.2 Adjustable UVLO
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Output Voltage Load Regulation
    4. 2.4  Output Voltage Line Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristics
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Powering Up
    10. 2.10 Powering Down
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
  6. 5Revision History

1.3.2 Adjustable UVLO

The under voltage lock out (UVLO) can be adjusted externally using R1 and R2. The EVM is set for a start voltage of 7.12 V and a stop voltage of 6.12 V using R1 = 220 kΩ and R2 = 43.2 kΩ. Use Equation 2 and Equation 3 to calculate required resistor values for different start and stop voltages.

Equation 2. GUID-8EE8B196-F44A-4366-A6A0-E7A55BDDE027-low.gif
Equation 3. GUID-E9D7C518-D408-47D5-82F7-7F401648C00F-low.gif

Ip = 1.15 µA, Ih = 3.3 µA, VENFALLING = 1.17 V and VENRISING = 1.21 V