SBOU209B August   2019  – August 2021 TMCS1100 , TMCS1100-Q1

 

  1.   1
  2.   Trademarks
  3. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  4. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  5. 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  VREF Input Filter
      4. 3.2.4  Buffer Amplifier Filter and Divider
      5. 3.2.5  Measurement Connector
      6. 3.2.6  Load Connectors
      7. 3.2.7  Ground Test Points
      8. 3.2.8  TMCS1100 Isolated Current-Sense Amplifier
      9. 3.2.9  Temperature Sensor
      10. 3.2.10 Reference Divider Buffer
  6. 4Operation
    1. 4.1 Measurements
    2. 4.2 Advanced Measurement Tips
  7. 5Schematics, PCB Layout, and Bill of Materials
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  8. 6Revision History

3.2.8 TMCS1100 Isolated Current-Sense Amplifier

U1x is the TMCS1100 isolated current-sense amplifier. Four gain-option segments are supplied within the TMCS1100EVM board. Each segment is populated with one of the available device gains. This configuration enables users to test the devices and determine the best gain setting for a given application. For x = A to D, the gain is 50 mV/A, 100 mV/A, 200 mV/A, and 400 mV/A, respectively.

  • The TMCS1100 can be used for both unidirectional and bidirectional applications.
  • A magnetic field is generated based on the load current that is connected across the inputs IS+ and IS–, and flows through the TMCS1100 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 gain. The maximum output voltage must remain within the range of 25 mV above ground to 100 mV below the supply voltage.
  • Choose an appropriate gain to create the largest appropriate output swing, and to minimize error.