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BOOSTXL-DRV8305EVM: feedback current

FRANK1
Expert 8545 points
Part Number: BOOSTXL-DRV8305EVM

Hi sir,

A student is using BOOSTXL-DRV8305EVM now, he have some inquiries on this EVM.
can you help me clarify it?
 
He use accessories to transmit the ISEN interface and operational amplifier circuit in BOOSTXL.

Now he need to get the actual three-phase feedback current signal,

What kind of treatment does he need to do to get it.

He want to do the closed-loop model of the motor,
three phase feedback current is needed.

He only found ISENA,ISENB and ISENC

6253.schematic.pdf



Thanks.

  • +1
    TI__Mastermind 26486 points

    Thank you for your question!

     

    If you want to get the 3 phase feedback current signals, this can be done by using the ISENA/B/C signals and using the following formula:

     

    1. Phase current = (ISENx - 1.65V)/(Gain*Rsense) = (ISENx – 1.65V)/(10V/V*0.007ohms)

     

    This is because ISENx = (phase current * sense resistance)*gain + 1.65V. It is important to remember that ISENx is a voltage, not a current.

    A common way to do this is to attach the ISENx signals to ADCs on your microcontroller to get the voltage of the signal, and then use the formula to calculate the sense current from that voltage.

     

    Regards,

     

    Anthony