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DRV8343-Q1: Current Sense Amplifiers' Input Voltage Range

Shinichi Yokota
Genius 9715 points
Part Number: DRV8343-Q1

Hello,

Input voltage ranges of DRV8343-Q1's current sense amplifiers are defined as VCOM = ±0.15 V (Max) and VDIFF = ±0.3 V (Max) in the data sheet and it gives me the impression that they are too narrow if I compare it with general op-amps.

Questions

  1. Are the specs independent of the CSA's gain or VREF divider setting?
  2. How could the CSA behave if the input ranges are violated? For example, parameters related to the CSA may get out of the specs but the CSA will continue to function, or strange behavior could appear, etc.

Best regards,
Shinichi Yokota

  • 0
    TI__Mastermind 26686 points

    Hi Yakota-san, 

    Thanks for your question! I will try to get back to you on this tomorrow.

    Regards,

    Anthony

  • +1
    TI__Mastermind 26686 points

    Hi Yakota-san,

    Since the sense amplifier circuitry is all integrated into the device, this introduces some limitations from a design standpoint compared to general op-amps which is why the input voltage range is more constrained than a more general op-amp.  If the input exceeds the Vcom or Vdiff spec, this can result in significant gain errors being introduced, leading to inaccurate CSA output results. While exceeding the Vcom or Vdiff spec should not damage the device as long as the abs max voltage of the pins are not exceeded, the CSAs cannot be guaranteed to work as described in the datasheet if the input voltage exceeds the specs.

    Regards,

    Anthony Lodi