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

2.3.2 INA180-Q1

The INA180-Q1 current-sense amplifier is designed for cost-optimized applications. These devices are part of a family of current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common mode voltages from –0.2V to +26V, independent of the supply voltage. The INA180-Q1 integrates a matched resistor gain network in four, fixed-gain device options: 20V/V, 50V/V, 100V/V, or 200V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

For this design, the selected gain of the INA180-Q1 is 20V/V and is powered from the VDDM pin of the TPSI3100-Q1 with a 100nF input capacitance. The output of this device serves as the alarm signal for the overcurrent detection circuit and feeds the resistor divider for the fault signal. Any comparable current-sense amplifier can be used.