SBOSAF6 June   2024 TMCS1127

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 Insulation Specifications
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical 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
      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 Ambient Field Rejection
      3. 8.3.3 High-Precision Signal Chain
        1. 8.3.3.1 Temperature Stability
        2. 8.3.3.2 Lifetime and Environmental Stability
      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. 9.2.3 Application Curve
    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 Nomenclature
    2. 10.2 Device Support
      1. 10.2.1 Development Support
    3. 10.3 Documentation Support
      1. 10.3.1 Related Documentation
    4. 10.4 Receiving Notification of Documentation Updates
    5. 10.5 Support Resources
    6. 10.6 Trademarks
    7. 10.7 Electrostatic Discharge Caution
    8. 10.8 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

8.3.5 Current-Sensing Measurable Ranges

The zero current reference voltage, VREF, along with device sensitivity, S, and supply voltage, VS, determine the TMCS1127 linear input current measurement ranges listed in the Device Comparison table. The maximum linear output voltage, VOUT,max, is limited to 100mV less than the supply voltage as shown in Equation 17. The minimum linear output voltage, VOUT,min, is limited to 100mV above ground as shown in Equation 18.

Equation 17. V O U T , m a x = V S - 100 m V
Equation 18. V O U T , m i n = 100 m V

Overall maximum dynamic range can be optimized with proper device selection by referring minimum and maximum linear output voltage swing to minimum and maximum linear input current range by dividing output voltage by sensitivity, S (see Equation 19 and Equation 20).

Equation 19. I I N ,   m a x + = V O U T , m a x - V O U T , 0 A S
Equation 20. I I N ,   m a x - = V O U T , 0 A - V O U T , m i n S

where

  • IIN,max+ is the maximum linear measurable positive input current.
  • IIN,max– is the maximum linear measurable negative input current.
  • S is the sensitivity of the device variant.
  • VOUT,0A is the appropriate zero current output voltage.

As examples for determining linear input current measurement range, consider TMCS1127A2A, TMCS1127B2A and TMCS1127C2A devices, all with 50mV/A sensitivity as shown in the Device Comparison table. When used with a 5V supply, the TMCS1127A2A has a balanced ±48A bidirectional linear current measurement range about the 2.5V zero current output reference voltage, VREF, as shown in Figure 8-2. When used with a 3.3V supply, the TMCS1127B2A has a balanced ±31A bidirectional linear current measurement range about the 1.65V zero current output reference voltage. If used with a 5V supply, the linear current measurement range of the TMCS1127B2A can be extended from –31A to 65A as shown in Figure 8-2. The TMCS1127C2A with a 0.33V zero current reference voltage is intended for measuring unidirectional currents. When used with a 3.3V supply the TMCS1127C2A has a unidirectional linear current measurement range from –5A to 57A which can be extended from –5A to 91.4A when used with a 5V supply.

TMCS1127 Output Voltage Relationship to Input Current for TMCS1127x2A Figure 8-2 Output Voltage Relationship to Input Current for TMCS1127x2A