SLVUBU3A April   2020  – October 2020 LM7480-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Description
    1. 2.1  Input Power and Load (J1/J3 and J2/J4):
    2. 2.2  Enable Control (J5):
    3. 2.3  Over Voltage Protection (J6):
    4. 2.4  Input Voltage Monitor (J8 and VIN_MON):
    5. 2.5  Two back-back connected MOSFETs (Q1/Q3 and Q2/Q4):
    6. 2.6  Output slew rate control (R2 and C2):
    7. 2.7  Output Schottky Diode (D2) and LED indication:
    8. 2.8  TVS selection for 12-V battery protection:
    9. 2.9  TVS selection for 24-V battery protection:
    10. 2.10 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 Over Voltage Protection
    4. 5.4 Enable Control
    5. 5.5 Hot-plug and Disable using EN
    6. 5.6 Inrush Current Control
    7. 5.7 Load Response
  7. 6Board Layout and Bill of Materials
    1. 6.1 Board Layout
    2. 6.2 Bill of Materials
  8. 7Revision History

1 Introduction

TI's LM74800 Evaluation Module LM74800EVM-CD helps designers evaluate the operation and performance of the LM74800-Q1 ideal diode controller with switched output. This evaluation module demonstrates how LM74800-Q1 controls two N-channel power MOSFETs with ideal diode MOSFET connected first followed by second MOSFET for switched output and power path cut-off. LM74800-Q1 is a dual gate drive Ideal diode controller where the first gate drive DGATE controls an external N-channel MOSFET to emulate an ideal diode and the second gate drive HGATE controls another external N-Channel MOSFET to cutoff the power path when disabled or during an over voltage condition. Second MOSFET is can also be used to clamp the output during over voltage or load dump conditions.

Note:

For Class A performance during input micro-short test LV124 E-10, it is recommended to connect EN/UVLO, J5 pin 2 to J10 pin 1 or an external control using J5 pin 2.