SBOSA86 March   2023 INA310A , INA310B

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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
  7. 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
      2. 7.3.2  Input-Signal Bandwidth
      3. 7.3.3  Low Input Bias Current
      4. 7.3.4  Low VSENSE Operation
      5. 7.3.5  Wide Fixed Gain Output
      6. 7.3.6  Wide Supply Range
      7. 7.3.7  Integrated Comparator
      8. 7.3.8  RESET Function
      9. 7.3.9  Short Propagation Delay
      10. 7.3.10 Comparator Input Bias Current
    4. 7.4 Device Functional Modes
      1. 7.4.1 Basic Connections
        1. 7.4.1.1 Overcurrent Threshold Connection
      2. 7.4.2 High-Side Switch Overcurrent Shutdown
      3. 7.4.3 Bidirectional Overcurrent Comparator
  8. 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 Current Sensing in a Solenoid Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Overload Recovery With Negative VSENSE
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Low-Side Switch Overcurrent Shutdown
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 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 Example
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2.2 Detailed Design Procedure

Figure 8-3 shows the basic connections to the INA310x. The inputs terminals (IN+ and IN­­–) must be connected to the current sense resistor as close as possible to minimize any resistance in series with the shunt resistor. The INA310x measures current across the 100-mΩ shunt that is placed in series with load. The INA310x measures the differential voltage across the shunt resistor, and the signal is internally amplified with a gain of 20 V/V.

R1 is fixed as 10.2 kΩ to avoid loading of OUT as recommended in Section 7.4.1.1. R2 is calculated as 3.4 kΩ using Equation 1. R1 (10.2 kΩ) and R2 (3.4 kΩ) divides down the output which is an input to the comparator. This sets the overcurrent alert threshold of 1.2 A.