TIDUF73 September   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Design Theory
      2. 2.2.2 Resistor Selection
        1. 2.2.2.1 Transistor and Diode Selection
      3. 2.2.3 Overcurrent Detection – Short-Circuit Protection
    3. 2.3 Highlighted Products
      1. 2.3.1 TPSI3100-Q1
      2. 2.3.2 INA180-Q1
      3. 2.3.3 TPSI2140-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 External Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

2.3.3 TPSI2140-Q1

The TPSI2140-Q1 is an isolated solid-state relay designed for high-voltage automotive and industrial applications. The TPSI2140-Q1 uses TI's high-reliability capacitive isolation technology in combination with internal back-to-back metal-oxide semiconductor field-effect transistors (MOSFET) to form a completely-integrated design requiring no secondary-side power supply.

In this design, the TPSI2140-Q1 is used as an isolated switch for discharging the capacitors after the precharge cycle. The switch is placed in series with a high-ohmic resistor to provide a low-power discharge that takes around two minutes to reach a safe voltage level of less than 60V.