TIDUEX5 October   2020

 

  1.   Description
  2.   Resources
  3.   Applications
  4.   Features
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Ideal Diode Design Overview
      2. 2.2.2 Current Sensing Amplifier Design Overview
      3. 2.2.3 OR Gate Design Overview
      4. 2.2.4 MOSFET Selection
        1. 2.2.4.1 Blocking MOSFET
        2. 2.2.4.2 Hot-Swap MOSFET
      5. 2.2.5 TVS Input Diode Selection
      6. 2.2.6 Inrush Current
    3. 2.3 Highlighted Products
      1. 2.3.1 LM74810-Q1
      2. 2.3.2 INA302-Q1
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Getting Started
      2. 3.1.2 Testing and Results
        1. 3.1.2.1 Over-Voltage Protection Cut-Off Mode
        2. 3.1.2.2 Over-Voltage Protection Clamping-Mode
        3. 3.1.2.3 ISO7637-2 Pulse 1
        4. 3.1.2.4 Overcurrent Protection
        5. 3.1.2.5 Load Dump
        6. 3.1.2.6 Cold Crank, Warm Start, and Cold Start
          1. 3.1.2.6.1 Cold Crank
          2. 3.1.2.6.2 Warm Start
          3. 3.1.2.6.3 Cold Start
        7. 3.1.2.7 Standby Current
        8. 3.1.2.8 Currency Sense Accuracy
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks

3.1.2.6 Cold Crank, Warm Start, and Cold Start

Cranking pulse testing is performed using Texas Instruments, Cranking Simulator for Automotive Applications Test Report which functions as an automotive cranking simulator. The test waveforms available are shown below. Testing is done to ensure design operates properly when there is a drop in the battery voltage as seen in the different waveforms.

GUID-20200710-SS0I-DQQ7-RGTC-NZTF8MW941TT-low.pngFigure 3-8 2s/div DaimlerChrysler Engine-Cranking Pulse, DC-10615.
GUID-20200710-SS0I-MGKF-2BC9-R8F0LCGNJVLJ-low.pngFigure 3-9 200ms/div Volkswagen Warm-Start Test Pulse, VM80000.
GUID-20200710-SS0I-N1JG-QL8B-N0KJSJRPN1CS-low.pngFigure 3-10 2s/div Volkswagen Cold-Start Test Pulse, VW80000.