SNVU191B October   2012  – December 2021 LMR12020

 

  1.   Trademarks
  2. 1Introduction
  3. 2Features
  4. 3Evaluation Module Schematic
  5. 4Powering and Loading Considerations
    1. 4.1 Quick Start Procedure
    2. 4.2 Starting Up
    3. 4.3 Synchronization
    4. 4.4 No Load Start-Up at High Output Voltage
    5. 4.5 Adjusting the Output Voltage
    6. 4.6 Typical Test Setup
  6. 5Board Images
  7. 6Performance Characteristics
  8. 7Bill of Materials
  9. 8PCB Layout
  10. 9Revision History

4.2 Starting Up

The EN pin is tied to VIN to simplify start-up. The pullup resistor allows the power supply design engineer to toggle EN independently, if desired, and observe the start-up behavior of the LMR12020. Use the EN post to disable the device by pulling this node to GND. A logic signal can be applied to the post to test start-up and shutdown of the device.