SLVSIH5 March   2026 LMS1225

PRODUCT PREVIEW  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
  7. 6Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 VCC and Undervoltage Lockout
      2. 6.3.2 Current Sense
      3. 6.3.3 Temperature Sensing and Reporting
      4. 6.3.4 Dead Time Compensation
      5. 6.3.5 Ideal Diode Mode
  8. 7Device and Documentation Support
    1. 7.1 Receiving Notification of Documentation Updates
    2. 7.2 Support Resources
    3. 7.3 Trademarks
    4. 7.4 Electrostatic Discharge Caution
    5. 7.5 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information
    1. 9.1 Mechanical Data

请参考 PDF 数据表获取器件具体的封装图。

6.3.2 Current Sense

The LMS1225 includes current sense emulation, which is output on the CS pin. The current sense emulation function creates a replica of the current through the MOSFET. Current sense emulation on the LMS1225 is able to represent both positive and negative current by sourcing and sinking current from the CS pin. When device is conducting current from source to drain, the CS pin sources current out of the CS pin. When the device is conducting current from drain to source, the CS pin sinks current into the CS pin.

Connect the CS pin to a voltage source, VRef, through a resistor (RCS). Read the voltage across the resistor to calculate the current through the resistor. The current through the resistor represents the current through the FET with a gain of 10μA/A. The VRef voltage source is from 0.9V to 2.1V.

If the VRef voltage source is unregulated, best practice is to use a differential ADC. If the voltage source is regulated, use a single ended ADC.

LMS1225 Current Sense Implementation With Regulated Voltage Source Figure 6-3 Current Sense Implementation With Regulated Voltage Source
LMS1225 Current Sense Implementation With Unregulated Voltage Source Figure 6-4 Current Sense Implementation With Unregulated Voltage Source