SLUUD73 December   2024 LM74680

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Device Information
  7. 2Hardware
    1. 2.1 Test Points and Connectors
    2. 2.2 Test Equipment and Setup
      1. 2.2.1 Power Supplies
      2. 2.2.2 Meters
      3. 2.2.3 Oscilloscope
      4. 2.2.4 Loads
    3. 2.3 Test Setup and Procedures
      1. 2.3.1 Power-Up With Enable
      2. 2.3.2 Load Step
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1.     Trademarks

2.3.1 Power-Up With Enable

Use the following instructions to capture the startup with EN profile.

  1. Set the input supply voltage VIN to 24Vac and current limit of 3A.
  2. Use a secondary supply for EN step and set it to 3V.
  3. Open the jumper J5 and connect secondary supply to TP5.
  4. Turn ON the AC supply.
  5. Turn ON the secondary supply.
  6. Observe the start-up profile of EN, BG1, BG2, TG1, TG2.
Figure 2-2 shows an example of power-up with EN profile captured on the LM74680EVM evaluation board.
LM74680 LM74680 Power-Up With EN Figure 2-2 LM74680 Power-Up With EN