TIDUCL0 January 2017
The inverter leg current sensing is done by monitoring the VDS of the low side MOSFETs. Table 13 gives the theoretical and actual amplifier output at a positive and negative current. The board temperature is approximately 30°C. The percentage error is calculated without offset or temperature calibration. The equivalent RDS_ON of 0.5 mΩ (two FETs in parallel) is taken for theoretical amplifier output calculation. Figure 42 to Figure 44 show the winding current and amplifier output waveform.
WINDING CURRENT (A) | AMPLIFIER OUTPUT (V) | THEORETICAL AMPLIFIER OUTPUT | % ERROR |
---|---|---|---|
24.4 | 1.86 | 1.894 | –1.79 |
-22.0 | 1.42 | 1.430 | –0.70 |