Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 32 subscribers
  • Views 181 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS34LV87T: Current Consumption Estimation

takahiro higuchi
Prodigy 140 points
Part Number: DS34LV87T

Hi team.

I am estimating the current consumption of the circuit.

Am I correct in recognizing that the maximum total current consumption of DS34LV87T is as follows?

Icc(100uA) + Io(150mA) x 4 outputs = 600.1mA

Also, the above calculation results in a large current.
Could you also tell me the current consumption during normal use?

Sincerely.

  • 0
    TI__Mastermind 46687 points

    Hi Takahiro,

    This calculation is only correct if you are maxing out the device by shorting the differential outputs under max rated temperature conditions. 

    If under typical RS-422 operating with 100 Ohm load:

    I_total = ICC + V_diff(typ; Rl = 100 Ohms)/ Rl *  number of active drivers --> the datasheet pegs typical voltage with 100 Ohm resistor at 2.6V so the driver current would be 26mA typically not the 150mA (which is max rated - and should only occur in max operating conditions with outputs shorted together) With all things considered you would be looking at closer to 26mA * 4 + 100uA = 104.1mA of current magnitude in typical use cases. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson

  • +1 in reply to Parker Dodson
    Prodigy 140 points

    Thank you for your response.
    It was very helpful.