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 Test Setup and Procedures

Make sure the evaluation board has default jumper settings as shown in Table 2-4.

Table 2-4 Default Jumper Setting for LM74681EVM Evaluation Board
Jumper Default Setting Functionality
J5 2-3 EN connected to VOUT+. EN pulled high.
J6 1-2 Output high D4 LED indication.
LM74681 LM74681EVM Setup With Test Equipment Figure 2-1 LM74681EVM Setup With Test Equipment

Use the following instructions before starting any test and repeat again before moving to next test.

  1. Set the power supply output VIN to 0V.
  2. Turn ON the power supply and set the power supply output VIN to 48V and current limit of 3A.
  3. Turn OFF the power supply.
  4. Set the jumper setting on EVM to default position as shown in Table 2-4.