SBOSAH3 April   2025 TMCS1148

ADVANCE INFORMATION  

  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 Limiting Values
    8. 6.8 Electrical Characteristics
  8. 7 Typical Characteristics
    1. 7.1 Insulation Characteristics Curves
  9. 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 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
  10. 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 Ambient Field Rejection
      3. 9.3.3 High-Precision Signal Chain
        1. 9.3.3.1 Temperature Stability
        2. 9.3.3.2 Lifetime and Environmental Stability
      4. 9.3.4 Internal Reference Voltage
      5. 9.3.5 Current-Sensing Measurable Ranges
      6. 9.3.6 Overcurrent Detection
        1. 9.3.6.1 Setting The User Configurable Overcurrent Threshold
          1. 9.3.6.1.1 Setting Overcurrent Threshold Using Power Supply Voltage
          2. 9.3.6.1.2 Setting Overcurrent Threshold Using Internal Reference Voltage
          3. 9.3.6.1.3 Setting Overcurrent Threshold Example
        2. 9.3.6.2 Overcurrent Output Response
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power-Down Behavior
  11. 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
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Nomenclature
    2. 11.2 Device Support
      1. 11.2.1 Development Support
    3. 11.3 Documentation Support
      1. 11.3.1 Related Documentation
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Support Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Mechanical Data
    2.     PACKAGING INFORMATION
    3. 13.2 Tape and Reel Information

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DVF|10
Thermal pad, mechanical data (Package|Pins)

9.3.5 Current-Sensing Measurable Ranges

The zero current reference voltage, VREF, along with device sensitivity, S, and supply voltage, VS, determine the TMCS1148 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 TMCS1148A7A devices with 40mV/A sensitivity, TMCS1148B6A devices with 33mV/A sensitivity, and TMCS1148E8A devices with 60mV/A sensitivity as shown in the Device Comparison table. When used with a 5V supply, the TMCS1148A7A has a balanced ±60A bidirectional linear current measurement range about the 2.5V zero current output reference voltage, VREF, as shown in Figure 9-2. When used with a 3.3V supply, the TMCS1148B6A has a balanced ±46.9A 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 TMCS1148B6A can be extended from –46.9A to 98.4A as shown in Figure 9-2. The TMCS1148E8A with a 0.5V zero current reference voltage is intended for measuring unidirectional currents. When used with a 5V supply the TMCS1148E8A has a unidirectional linear current measurement range from –6.6A to 73.3A as shown in Figure 9-2.

TMCS1148 Output Voltage Relationship to Input Current for TMCS1148xxA Figure 9-2 Output Voltage Relationship to Input Current for TMCS1148xxA