SBOU249 December   2020 TMCS1108 , TMCS1108-Q1

 

  1.   Trademarks
  2. 1General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  3. 2Overview
    1. 2.1 Kit Contents
    2. 2.2 Related Documentation From Texas Instruments
  4. 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 Measurement Connector
      4. 3.2.4 Load Connectors
      5. 3.2.5 Ground Test Points
      6. 3.2.6 TMCS1108 Isolated Current-Sense Amplifier
      7. 3.2.7 Temperature Sensor
  5. 4Operation
    1. 4.1 Measurements
    2. 4.2 Advanced Measurement Tips
  6. 5Schematics, PCB Layout, and Bill of Materials
    1. 5.1 Schematics
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials

2 Overview

The TMCS1108 Hall-effect current sense amplifier (also called an isolated current-sense amplifier) senses magnetic flux generated from current passing through the lead frame at common-mode voltages from 0 VDC to 100 VDC, independent of the supply voltage. In both bidirectional (B) and unidirectional (U) configurations, four fixed gains are available: 50 mV/A, 100 mV/A, 200 mV/A, and 400 mV/A. These devices operate from a single 3-V to 5.5-V power supply, drawing a maximum of 5 mA of supply current per amplifier channel. The TMCS1108 is currently available in an 8-pin, SOIC, surface-mount package. Table 2-1 lists the available gain options.

Table 2-1 TMCS1108Ax Device Summary
ProductDirectionGain
TMCS1108A1BBidirectional50 mV/A
TMCS1108A2BBidirectional100 mV/A
TMCS1108A3BBidirectional200 mV/A
TMCS1108A4BBidirectional400 mV/A
TMCS1108A1UUnidirectional50 mV/A
TMCS1108A2UUnidirectional100 mV/A
TMCS1108A3UUnidirectional200 mV/A
TMCS1108A4UUnidirectional400 mV/A