SLUUD80 December   2024 LM74681

 

  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 UVLO Functionality
      2. 2.3.2 Polarity Agnostic Startup
  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 UVLO Functionality

Use the following instructions to capture the UVLO behavior of the device.

  1. Set the input supply voltage VIN to 25V and current limit of 3A.
  2. Turn ON the input power supply.
  3. Observe the behavior of TG1-IN1 and BG1.
  4. Turn OFF the power supply and reverse the connection on J1 and J2.
  5. Observe the behavior of TG2-IN2 and BG2.

Figure 2-2 and Figure 2-3 show examples of the UVLO profile captured on the LM74681EVM evaluation board.

LM74681 LM74681 Forward Connection UVLO Behavior Figure 2-2 LM74681 Forward Connection UVLO Behavior
LM74681 LM74681 Reverse Connection UVLO Behavior Figure 2-3 LM74681 Reverse Connection UVLO Behavior