SBAU421B June   2023  – December 2023 TMCS1123

 

  1.   1
  2.   TMCS1123xEVM
  3.   Trademarks
  4. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  6. 3Hardware
    1. 3.1 Features
    2. 3.2 Circuitry
      1. 3.2.1 Bypass Capacitors
      2. 3.2.2 Output Filter
      3. 3.2.3 Overcurrent Set Point and Overcurrent Circuitry
      4. 3.2.4 Load Connectors
      5. 3.2.5 TMCS1123 Isolated Current-Sense Amplifier
  7. 4Operation
    1. 4.1 Measurements
    2. 4.2 Advanced Measurement Tips
  8. 5Schematics, PCB Layout, and Bill of Materials
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  9. 6Revision History

3.2.5 TMCS1123 Isolated Current-Sense Amplifier

U1_x is the TMCS1123 isolated current-sense amplifier. The TMCS1123xEVM board is divided into five detachable segments. Each segment is populated with one of the available device sensitivities for the chosen operating point A, B, or C. This configuration enables users to test all possible variants of the devices to determine the best sensitivity setting for a given application.

  • A magnetic field is generated based on the load current that is connected across the inputs IN+_x and IN–_x, and flows through the TMCS1123 leadframe.
  • The output voltage swing limitation and required load current sensing range are the key factors when determining device selection.
  • The selected device must allow the output voltage to remain within the acceptable range after the load current is transduced and amplified by the respective device sensitivity. The maximum output voltage must remain within the range of 10 mV above ground to 100 mV below the supply voltage.
  • Choose an appropriate sensitivity to create the largest appropriate output swing and to minimize error.