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

2.4 Output Schottky Diode (D4, D10) and LED Indication (D6, D12)

TI recommends Schottky diode D4 (channel 1) and D10 (channel 2) in conditions where output voltage can have negative transients that can exceed absolute maximum ratings of LM74502-Q1. The Schottky diodes can be removed if negative transients are not possible at the output. D6, D12 provides an indication on the status of the output voltage on channel 1 and channel 2.