JAJSRU9 October   2023 TMCS1133

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 Insulation Specifications
    6. 6.6 Electrical Characteristics
  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 CMTI, Common-Mode Transient Immunity
    3. 7.3 Safe Operating Area
      1. 7.3.1 Continuous DC or Sinusoidal AC Current
  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 Ambient Field Rejection
      4. 8.3.4 High-Precision Signal Chain
        1. 8.3.4.1 Temperature Stability
        2. 8.3.4.2 Lifetime and Environmental Stability
      5. 8.3.5 Internal Reference Voltage
      6. 8.3.6 Current-Sensing Measurable Ranges
      7. 8.3.7 Overcurrent Detection
      8. 8.3.8 Sensor Diagnostics
    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 ドキュメントの更新通知を受け取る方法
    4. 10.4 サポート・リソース
    5. 10.5 Trademarks
    6. 10.6 静電気放電に関する注意事項
    7. 10.7 用語集
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
    2. 12.2 Tape and Reel 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

9.2.2 Detailed Design Procedure

The primary design parameter for using the TMCS1133 is the optimum sensitivity variant based on the required measured current levels and the selected supply voltage. Positive and negative currents are measured in this in-line phase current application example, therefore select a bidirectional variant. The TMCS1133 has a precision internal reference voltage that determines the zero current output voltage, VOUT,0A. The internal reference voltage on TMCS1133AxA variants, with zero current output voltage VOUT,0A = 2.5 V is intended for bidirectional current measurements when used with 5-V power supplies. The internal reference voltage on TMCS1133BxA variants, with zero current output voltage VOUT,0A = 1.65 V is intended for bidirectional current measurements when used with 3.3-V power supplies. Further consideration of noise and integration with an ADC can be explored, but is beyond the scope of this application design example. The TMCS1133 output voltage VOUT is proportional to the input current IIN as defined by Equation 29 with output offset set by VOUT,0A.

Equation 29. VOUT=IIN×S+VOUT,0A

Design of the sensing solution focuses on maximizing the sensitivity of the device while maintaining linear measurement over the expected current input range. The TMCS1133 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 VOUT,max is defined by Equation 30.

Equation 30. VOUT,max=VS,min-SwingVS

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
SwingVS0.1 V
VOUT,max4.8 V
VOUT,0A2.5 V
VOUT,max – VOUT,0A2.3 V

These design parameters result in a maximum positive linear output voltage swing of ±2.3 V about VOUT,0A = 2.5 V. To determine which sensitivity variant of the TMCS1133 most fully uses this linear range, calculate the maximum current range by Equation 31 for a bidirectional current ±IIN,max.

Equation 31. I I N ,   m a x = V O U T , m a x - V O U T , 0 A S

where

  • S is the sensitivity of the relevant AxA variant.

Table 9-5 shows such calculation for each gain variant of the TMCS1133 with the appropriate sensitivities.

Table 9-5 Maximum Full-Scale Current Ranges With 2.3-V Positive Output Swing
VARIANTSENSITIVITYIIN,max
TMCS1133A1A25 mV/A±92 A
TMCS1133A2A 50 mV/A ±46 A
TMCS1133A3A75 mV/A±30.6 A
TMCS1133A4A100 mV/A±23 A
TMCS1133A5A150 mV/A±15.3 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 TMCS1133A4A with a sensitivity of 0.1 V/A is the proper selection because the maximum calculated ±23 A linear measurable range is sufficient for the desired ±20 A full-scale current range.