SNOU187 September   2021

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Description
    1. 2.1 Input Power and Load (J2, J6 and J3, J7):
    2. 2.2 Enable Control (J5):
    3. 2.3 Two Back-to-Back Connected MOSFETs (Q1 and Q2):
    4. 2.4 Output Slew Rate Control (R5 and C5):
    5. 2.5 Output Schottky Diode (D3) and LED Indication:
    6. 2.6 TVS Selection for 12-V Battery Protection:
    7. 2.7 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

2.3 Two Back-to-Back Connected MOSFETs (Q1 and Q2):

Q1 is a 60-V rated N-channel MOSFET capable to support 5-A automotive ECU applications. Q1 helps support reverse battery protection up to –33 V, reverse-current blocking and also dissipate the automotive ISO7637 pulse 1 transient during VDS clamp operation. By default, the Q2 FET is not populated and is bypassed by R1 resistor. In order to evaluate power path cut-off ON/OFF and over voltage cut-off functionalities, Q2 needs to be populated and R1 removed.