SLUUCU8 july   2023

 

  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 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Setup
    2. 2.2 Physical Access
      1. 2.2.1 Test Equipment and Setup
        1. 2.2.1.1 Power Supplies
        2. 2.2.1.2 Meters
        3. 2.2.1.3 Oscilloscope
        4. 2.2.1.4 Loads
    3. 2.3 General Configurations
  8. 3Implementation Results
    1. 3.1 Test Setup and Procedures
      1. 3.1.1 Power-Up and Power-Down With EN Control
      2. 3.1.2 Input Overvoltage Test
      3. 3.1.3 Output Hot-Short Test
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1.     Trademarks

3.1.2 Input Overvoltage Test

Use the following instructions to verify the overvoltage protection feature of LM74912-Q1.

  1. Remove the input 33-V TVS (D1) incase you want to set and test the input overvoltage threshold, which is greater than the breakdown voltage (40V)of the TVS.
  2. Set the input supply voltage VIN to 12 V and current limit of 10 A.
  3. Turn ON the power supply and observe start-up of output voltage, HGATE, and DGATE.
  4. Slowly increase the input voltage to 40 V. Observe the HGATE going low and turn OFF the load switch FETs (Q2 and Q4) when the input voltage reaches overvoltage protection threshold of 37 V.
GUID-20230717-SS0I-4T8N-FVRN-VTDTFZLM3QF7-low.png Figure 3-6 Overvoltage Protection