JAJSNR9B April   2016  – April 2022 INA301-Q1

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  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 Alert Output ( ALERT Pin)
      2. 7.3.2 Current-Limit Threshold
        1. 7.3.2.1 Resistor-Controlled Current Limit
          1. 7.3.2.1.1 Resistor-Controlled, Current-Limit Example
        2. 7.3.2.2 Voltage-Source-Controlled Current Limit
      3. 7.3.3 Hysteresis
    4. 7.4 Device Functional Modes
      1. 7.4.1 Alert Mode
        1. 7.4.1.1 Transparent Output Mode
        2. 7.4.1.2 Latch Output Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Selecting a Current-Sensing Resistor
        1. 8.1.1.1 Selecting a Current-Sensing Resistor Example
      2. 8.1.2 Input Filtering
      3. 8.1.3 INA301-Q1 Operation With Common-Mode Voltage Transients Greater Than 36 V
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
7.3.2.1.1 Resistor-Controlled, Current-Limit Example

If the current level indicating an out-of-range condition is present is 20 A, and the current-sense resistor value is 10 mΩ, then the input threshold signal is 200 mV. The INA301A1-Q1 has a gain of 20, therefore, the resulting output voltage at the 20-A input condition is 4 V. The value for RLIMIT is selected to allow the device to detect to this 20-A threshold, indicating an overcurrent event occurred. When the INA301-Q1 detects this out-of-range condition, the ALERT pin asserts and pulls low. For this example, Table 7-2 lists the calculated value of RLIMIT required to detect a 4-V level as 50 kΩ.

Table 7-2 Example of Calculating the Limit Threshold Setting Resistor, RLIMIT
PARAMETEREQUATION
VTRIPVOUT at the desired current trip valueILOAD × RSENSE x Gain
↓
20 A x 10 mΩ x 20 V/V = 4 V
VLIMITThreshold limit voltageVLIMIT = VTRIP
ILIMIT × RLIMIT
RLIMITThreshold limit-setting resistor valueVLIMIT / ILIMIT
↓
4 V / 80 µA = 50 kΩ