CSA output has an offset induced due to ground differences between the sense FET and output FET. When running trapezoidal control or another single-shunt based control (sensored sine, for example) this CSA offset has no impact to operation. When running sensorless sinusoidal or FOC control where two or three current sense are required, some current distortion and noise may occur unless the user implements the corrective action below.

Corrective Action: Implement the below equations in firmware to correct for any current induced offset:

1. When all three current sense amplifiers are used:
   Equation 3. $i_a= 1.001152*i_{a\_sensed} -0.003375*i_{b\_sensed} -0.003103*i_{c\_sensed}$
   Equation 4. $i_b= 0.002369*i_{a_{sensed}} +1.000665*i_{b\_sensed} -0.019126*i_{c\_sensed}$
   Equation 5. $i_c= 0.001234*i_{a_{sensed}}+ 0.001595*i_{b_{sensed}} +0.998166*i_{c\_sensed}$
2. When only two of the three current sense amplifiers are used:
   1. Current sensed in phases A & B:
      Equation 6. $i_a= 1.004346*i_{a\_sensed} -0.000199*i_{b\_sensed}$
      Equation 7. $i_b=0.022060*i_{a_{sensed}} +1.020405*i_{b\_sensed}$
      Equation 8. $i_c=-\left(i_a+i_b\right)$
   2. Current sensed in phases B & C:
      Equation 9. $i_b= 0.998309*i_{b\_sensed} -0.021427*i_{c\_sensed}$
      Equation 10. $i_c= 0.000368*i_{b_{sensed}} +0.996967*i_{c\_sensed}$
      Equation 11. $i_a=-\left(i_b+i_c\right)$
   3. Current sensed in phases C & A
      Equation 12. $i_a= 1.004547*i_{a_{sensed}} +0.000195*i_{c\_sensed}$
      Equation 13. $i_c= 0.000371*i_{a_{sensed}}+0.996975*i_{c\_sensed}$
      Equation 14. $i_b=-\left(i_a+i_c\right)$