low side shunt on CCB021M12FM3

andersonm

Hello,

I'm designing a motor controller around the CCB021M12FM3 and am wanting to do current measurement with a 3 shunt resistors on the low sides of each leg. What would be the ramifications if I float the S2/S4/S6 pins so that I don't have to have a low side power supply dedicated to each leg? In other words, each DC- line would go to the shunt for that phase, then to the low side ground.

I realize this would probably throw off the DESAT detection of the ADUM4146 I am using, but are there other concerns?