SBOSA31B February   2023  – March 2024 INA241A-Q1 , INA241B-Q1

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 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Amplifier Input Common-Mode Signal
        1. 7.3.1.1 Enhanced PWM Rejection Operation
        2. 7.3.1.2 Input-Signal Bandwidth
        3. 7.3.1.3 Low Input Bias Current
        4. 7.3.1.4 Low VSENSE Operation
        5. 7.3.1.5 Wide Fixed Gain Output
        6. 7.3.1.6 Wide Supply Range
    4. 7.4 Device Functional Modes
      1. 7.4.1 Adjusting the Output With the Reference Pins
      2. 7.4.2 Reference Pin Connections for Unidirectional Current Measurements
        1. 7.4.2.1 Ground Referenced Output
        2. 7.4.2.2 VS Referenced Output
      3. 7.4.3 Reference Pin Connections for Bidirectional Current Measurements
        1. 7.4.3.1 Output Set to External Reference Voltage
        2. 7.4.3.2 Output Set to Mid-Supply Voltage
        3. 7.4.3.3 Output Set to Mid-External Reference
        4. 7.4.3.4 Output Set Using Resistor Divider
      4. 7.4.4 High Signal Throughput
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 RSENSE and Device Gain Selection
    2. 8.2 Typical Application
      1. 8.2.1 Inline Motor Current-Sense Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Supply Decoupling
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Examples
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.1.1 Enhanced PWM Rejection Operation

The enhanced PWM rejection feature of the INA241x-Q1 provides increased attenuation of large common-mode ΔV/Δt transients. Large ΔV/Δt common-mode transients associated with PWM signals are employed in applications such as motor or solenoid drive and switching power supplies. The disturbances that can occur at the output of a current sense amplifier from common-mode transients causes erroneous measurements and impose limitations when the output is valid. The INA241x-Q1 is designed with high common-mode rejection techniques to reduce large ΔV/Δt transients before the system is disturbed. As a result, this makes system design simple with INA241x-Q1. The high AC CMRR, in conjunction with signal bandwidth, allows the INA241x-Q1 to minimize output disturbances and ringing during common-mode transitions when compared against traditional current-sensing amplifiers.

GUID-20220816-SS0I-ZDZ1-MVSK-JQCDNRQMXHKR-low.svg Figure 7-1 Enhanced PWM Rejection Performance

Figure 7-1 shows the INA241x-Q1 PWM enhancement performance. When INA241x-Q1 senses the large common-mode ΔV/Δt transients, the device holds the output for 1 μs, thereby preventing the common-mode disturbance from propagating to the output. If another common-mode transient occurs during the following 3 μs, the INA241x-Q1 relies on high BW and AC CMMR to attenuate the effect of common-mode transient. The enhanced PWM rejection is achieved up to a PWM frequency of 125 kHz or if common-mode transient edges are separated by a 3 μs interval or more.