SBOS825E September   2019  – June 2025 TMCS1101

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Typical Characteristics
      1. 6.10.1 Insulation Characteristics Curves
  8. 7 Parameter Measurement Information
    1. 7.1 Accuracy Parameters
      1. 7.1.1 Sensitivity Error
      2. 7.1.2 Offset Error and Offset Error Drift
      3. 7.1.3 Nonlinearity Error
      4. 7.1.4 Power Supply Rejection Ratio
      5. 7.1.5 Common-Mode Rejection Ratio
      6. 7.1.6 External Magnetic Field Errors
    2. 7.2 Transient Response Parameters
      1. 7.2.1 Slew Rate
      2. 7.2.2 Propagation Delay and Response Time
      3. 7.2.3 Current Overload Parameters
      4. 7.2.4 CMTI, Common-Mode Transient Immunity
    3. 7.3 Safe Operating Area
      1. 7.3.1 Continuous DC or Sinusoidal AC Current
      2. 7.3.2 Repetitive Pulsed Current SOA
      3. 7.3.3 Single Event Current Capability
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Current Input
      2. 8.3.2 Input Isolation
      3. 8.3.3 High-Precision Signal Chain
        1. 8.3.3.1 Temperature Stability
        2. 8.3.3.2 Lifetime and Environmental Stability
        3. 8.3.3.3 Frequency Response
        4. 8.3.3.4 Transient Response
      4. 8.3.4 Internal Reference Voltage
      5. 8.3.5 Current-Sensing Measurable Ranges
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Behavior
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Total Error Calculation Examples
        1. 9.1.1.1 Room Temperature Error Calculations
        2. 9.1.1.2 Full Temperature Range Error Calculations
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.2 Detailed Design Procedure

The primary design parameter for using the TMCS1101 is selecting the correct sensitivity variant, and because positive and negative current must be measured a bidirectional variant must be selected (A1B-A4B). Further consideration of noise and integration with an ADC can be explored, but is beyond the scope of this application design example. The TMCS1101AxB transfer function is effectively a transimpedance with a variable offset set by VOUT,0A, which is internally set to half of the analog supply as defined by Equation 29.

Equation 29. VOUT = IIN × S + VOUT,0A = IIN × S + VS × .05

Design of the sensing device focuses on maximizing the sensitivity while maintaining linear measurement over the expected current input range. The TMCS1101 has a slightly smaller linear output range to the supply than to ground; therefore, the measurable current range is always constrained by the positive swing to supply, SwingVS. To account for the operating margin, consider the minimum possible supply voltage VS,min. With the previous parameters, the maximum linear output voltage range is the range between VOUT,max and VOUT,0A, as defined by Equation 30.

Equation 30. VOUT,max – VOUT,0A = VS,min – SwingVS – 0.5 × VS,min

Design parameters for this example application are shown in Table 9-4 along with the calculated output range.

Table 9-4 Example Application Design Parameters
DESIGN PARAMETEREXAMPLE VALUE
SwingVS0.2V
VOUT,max4.7V
VOUT,0A at VS,min2.45V
VOUT,max – VOUT,0A2.25V

These design parameters result in a maximum positive linear output voltage swing of 2.25V. To determine which sensitivity variant of the TMCS1101 most fully uses this linear range, calculate the maximum current range by Equation 31 for a bidirectional current (IB,MAX).

Equation 31. IB,max = (VOUT,max – VOUT,0A) / SA<x>

where

  • SA<x> is the sensitivity of the relevant A1-A4 variant.

Table 9-5 shows such calculation for each gain variant of the TMCS1101 with the appropriate sensitivities.

Table 9-5 Maximum Full-Scale Current Ranges With 2.25V Positive Output Swing
SENSITIVITY VARIANTSENSITIVITYIB,MAX
TMCS1101A1B50mV/A±45A
TMCS1101A2B100mV/A±22.5A
TMCS1101A3B200mV/A±11.25A
TMCS1101A4B400mV/A±5.6A

In general, the highest sensitivity variant that provides for the desired full-scale current range is selected. For the design parameters in this example, the TMCS1101A2B with a sensitivity of 0.1V/A is the proper selection because the maximum calculated ±22.5A linear measurable range is sufficient for the desired ±20A full-scale current.