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INA240: PWM rejection

Kuramochi Tadahiko
Guru 28715 points
Part Number: INA240

Hi,

There is PWM rejection in the block diagram of INA240.

Could you tell me the principle of this block?

Best Regards,

Kuramochi 

  • +1
    TI__Mastermind 20475 points

    Kuramochi-san,

    The purpose of this block is to actively look for high voltage transients on the common mode of a PWM signal and help suppress these in the output of the INA240, as they are not a true differential signal, but overshoot from the rapid slewing of the common mode signal. This is important in applications such as motor control, where PWM may be used as a control method for commutation. This is discussed in depth with plots of common mode pulse in this app note.