SNOU186 September   2021 LM74720-Q1 , LM74722-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, J8/J12 and J9/J13):
    2. 2.2 Enable Control (J4 and J11):
    3. 2.3 Two Back-to-Back Connected MOSFETs (Q1/Q3-Q2/Q4 and M1/M3-M2/M4):
    4. 2.4 Output Slew Rate Control (R3 and C4, R10 and C13):
    5. 2.5 Output Schottky Diode (D3, D8) and LED Indication (D4, D10) :
    6. 2.6 TVS Selection for 12-V Battery Protection:
    7. 2.7 TVS Selection for 24-V Battery Protection:
    8. 2.8 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 Enable Control
    4. 5.4 Hot-Plug and Disable using EN
    5. 5.5 Inrush Current Control
    6. 5.6 Load Response
  7. 6Board Layout and Bill of Materials
    1. 6.1 Board Layout
    2. 6.2 Bill of Materials

2.5 Output Schottky Diode (D3, D8) and LED Indication (D4, D10) :

Schottky diode D3 (channel 1) and D8 (channel 2) are populated on EVM by default and are recommended in conditions where output voltage can have negative transients that can exceed absolute maximum ratings of LM7472x-Q1. The Schottky diodes can be removed if negative transients are not possible at the output.

D4, D10 provides an indication on the status of the output voltage on channel 1 and channel 2.
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