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

3.1 Gain Error vs Temperature

Gain error refers to the deviation of the actual gain from the nominal gain value, often influenced by temperature variations. In the context of a three-phase motor driver such as the DRV8376, gain typically exhibits a linear dependence across a temperature range of -40°C to +125°C, impacting the accuracy of current sense amplifiers or PWM outputs. Figure 3-2 shows the gain error of DRV8376 at two different motor voltages 24V and 48V respectively.

Uncalibrated Gain ErrorFigure 3-2 Uncalibrated Gain Error