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TMDSHVMTRPFCKIT: Question about TMDSHVMTRPFCKIT

Genius 3095 points

Part Number: TMDSHVMTRPFCKIT

Dear team:

The design of bus current acquisition circuit in HVMotorCtrl+PFC-SCH [R1.1] is as follows:

As you can see, in the figure, the sampling resistance is connected to the FET connection end of the lower bridge arm to the same input end of the op amp for summation.

However, in DRV830x-HC-C2-KIT_v105 drive circuit, there are the following designs:

It can be seen that, unlike the previous circuit, the GND terminals of three sampling resistors are connected to the op-amp co-input terminals for summation.

Why are there two different designs?

Best regards