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INA3221: Connection between VPU and VS

Part Number: INA3221

Hi team,

My customer wants to use the INA3221. and he wants to know can we connect the pin VPU to pin VS directly. or do we need some isolation inductor between VPU and VS?

Thanks a lot!

Lacey

  • Hello Lacey,

    The customer can connect the VPU directly to the VS pin or Vs rail. Unless the customer is tieing Vs to one of the bus voltages (although I would think not since the max Vs is 6V) then this is perfectly fine. On the EVM we do not have an external resistor on the VPU pin and it can be driven with any external voltage. In the datasheet we show the VPU pin connected to Vs. The resistor divider network is shown as a possible option if the PV output voltage (equal to VPU) needs to be divided down at all.

    Hope this helps.

    Sincerely,

    Peter Iliya

    Current Sense Applications