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Original question:

LMP8350: Reference design

LMP8350: Current consumption of Vocm

yuki-kubo
Prodigy 30 points
Part Number: LMP8350
Other Parts Discussed in Thread: TINA-TI

Hello
thank you for your reply.

I have an additional question.
If the Vocm voltage is supplied externally, what is the current consumption of Vocm?

  • 0
    TI__Mastermind 26795 points

    Hello,

      The total amount of sinking/sourcing current from an external reference voltage will depend on you external circuitry and your output common-mode voltage requirements. The device datasheet shows the internal circuitry of the Vocm pin of the device, and suggests buffering (low-impedance output) your external voltage divider + voltage reference. 

      

       The external current needed to sink/source to the internal circuitry can be calculated using the below equation:  (replace 50kOhm with 60kOhm) 

      

      Below is an example when setting Vocm to 1.5V with single supply of 5V:

      The Tina-TI simulation file is attached below.

     LMP8350.TSC

    Thank you,

    Sima