SDAA048 July   2025 DRV8376

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Advantages and Challenges of Low-Side Current Sensing with DRV8376
    1. 2.1 Advantages of Low Side Current Sensing
      1. 2.1.1 Low Common Mode Voltage
      2. 2.1.2 Cost Effectiveness
    2. 2.2 Challenges of Low side Current Sensing
      1. 2.2.1 Gain Error
      2. 2.2.2 Temperature Drift
  6. 3DRV8376 Current Sense Amplifier (CSA) Architecture
    1. 3.1 Gain Error vs Temperature
    2. 3.2 Calibration Methods
  7. 4Summary
  8. 5References

2.2.1 Gain Error

Gain error arises from mismatches in the internal gain-setting resistors of the DRV8376 and mismatch between the power stage FET and senseFET. For example, a 1% mismatch in the gain network of the CSA (for example, G_CSA = 0.4V/A) can introduce a corresponding 1% error in the SOx output voltage, affecting current measurement accuracy. In motor drives, this error can lead to imprecise torque control or incorrect commutation timing, reducing efficiency and performance.