SNOU191 January   2022 LM74502-Q1 , LM74502H-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Description
    1. 2.1 Input Power and Load (J1/J5 and J2/J6, J7/J11 and J8/J12)
    2. 2.2 Two Back-to-Back Connected MOSFETs (Q1/Q2–Q3/Q4 and Q6/Q7–Q8/Q9)
    3. 2.3 Output Slew Rate Control (R1 and C1)
    4. 2.4 Output Schottky Diode (D4, D10) and LED Indication (D6, D12)
    5. 2.5 Test Points
  4. 3Schematic
  5. 4Test Equipment Requirements
    1. 4.1 Power Supplies
    2. 4.2 Meters
    3. 4.3 Oscilloscope
    4. 4.4 Loads
  6. 5Test Setup and Results
    1. 5.1 Initial Setup
    2. 5.2 Power Up
    3. 5.3 Turn-ON with EN
    4. 5.4 Inrush Current Control
    5. 5.5 Overvoltage Response
    6. 5.6 Reverse Polarity Protection
  7. 6Board Layout and Bill of Materials
    1. 6.1 Board Layout
    2. 6.2 Bill of Materials

2 Description

The LM74502-Q1EVM is configured by default for evaluating 12-V and 24-V reverse polarity protection through external back-to-back FET control, with additional abilities to configure and evaluate LM74502H-Q1 as a load switch and LM74502-Q1 as a surge stopper/transient suppressor. Also, the module enables the user to adjust and evaluate overvoltage cutoff, clamp protection and output voltage slew rate control.