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INA219: Would Decoupling cap impact the value of sense current?

Jim CHEN
Expert 4795 points
Part Number: INA219

Dear Team,

My customer is using INA219 on server application.

They would like to add more than 270 uF decoupling cap on +12V_PCIE2(V-) and +12V_RISER(V+) in below schematic.

Will it impact the value of sense current in INA219? 

Please help to advise.

Thank you.

Jim

  • 0
    Guru 140200 points

    Hi Jim,

    it's not unusual that the load and the supply are decoupled by big capacitances. So, I do not see why this should be a problem, provided you never violate the absolute maximum ratings of INA219.

    Kai

  • 0
    TI__Mastermind 26335 points

    Hello Jim,

    Thanks for reaching out on the forum.  As kai stated, placing the capacitors on the input pins should not impact your current measurement.  Typically the only pin that you need to be careful with adding too much capacitance would be the output pin as that could cause instability for the part.