JAJSJX1 June   2021 TMCS1101-Q1

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Ratings
    6. 7.6  Insulation Specifications
    7. 7.7  Safety-Related Certifications
    8. 7.8  Safety Limiting Values
    9. 7.9  Electrical Characteristics
    10. 7.10 Typical Characteristics
      1. 7.10.1 Insulation Characteristics Curves
  8. 8 Parameter Measurement Information
    1. 8.1 Accuracy Parameters
      1. 8.1.1 Sensitivity Error
      2. 8.1.2 Offset Error and Offset Error Drift
      3. 8.1.3 Nonlinearity Error
      4. 8.1.4 Power Supply Rejection Ratio
      5. 8.1.5 Common-Mode Rejection Ratio
      6. 8.1.6 External Magnetic Field Errors
    2. 8.2 Transient Response Parameters
      1. 8.2.1 Slew Rate
      2. 8.2.2 Propagation Delay and Response Time
      3. 8.2.3 Current Overload Parameters
      4. 8.2.4 CMTI, Common-Mode Transient Immunity
    3. 8.3 Safe Operating Area
      1. 8.3.1 Continuous DC or Sinusoidal AC Current
      2. 8.3.2 Repetitive Pulsed Current SOA
      3. 8.3.3 Single Event Current Capability
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Current Input
      2. 9.3.2 Input Isolation
      3. 9.3.3 High-Precision Signal Chain
        1. 9.3.3.1 Temperature Stability
        2. 9.3.3.2 Lifetime and Environmental Stability
        3. 9.3.3.3 Frequency Response
        4. 9.3.3.4 Transient Response
      4. 9.3.4 Internal Reference Voltage
      5. 9.3.5 Current-Sensing Measurable Ranges
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power-Down Behavior
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Total Error Calculation Examples
        1. 10.1.1.1 Room Temperature Error Calculations
        2. 10.1.1.2 Full Temperature Range Error Calculations
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Development Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 サポート・リソース
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

10.2.2 Detailed Design Procedure

The primary design parameter for using the TMCS1101-Q1 is selecting the correct sensitivity variant, and because positive and negative current must be measured a bidirectional variant should 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-Q1 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 solution focuses on maximizing the sensitivity of the device while maintaining linear measurement over the expected current input range. The TMCS1101-Q1 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 10-4 along with the calculated output range.

Table 10-4 Example Application Design Parameters
DESIGN PARAMETEREXAMPLE VALUE
SwingVS0.2 V
VOUT,max4.7 V
VOUT,0A at VS,min2.45 V
VOUT,max – VOUT,0A2.25 V

These design parameters result in a maximum positive linear output voltage swing of 2.25 V. To determine which sensitivity variant of the TMCS1101-Q1 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 10-5 shows such calculation for each gain variant of the TMCS1101-Q1 with the appropriate sensitivities.

Table 10-5 Maximum Full-Scale Current Ranges With 2.25-V Positive Output Swing
SENSITIVITY VARIANTSENSITIVITYIB,MAX
TMCS1101A1B-Q150 mV/A±45 A
TMCS1101A2B-Q1100 mV/A±22.5 A
TMCS1101A3B-Q1200 mV/A±11.25 A
TMCS1101A4B-Q1400 mV/A±5.6 A

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-Q1 with a sensitivity of 0.1 V/A is the proper selection because the maximum calculated ±22.5-A linear measurable range is sufficient for the desired ±20-A full-scale current.