• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 163 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

LMR51420: EN pin sourcing current

Hugues Lepage
Prodigy 10 points
Part Number: LMR51420

Hello,

I am wondering if the datasheet is wrong or my device is defective! From the datasheet SLUSEF6C, the post rising threshold current should be typ10nA/max 200nA. As I measure 86uA on my prototype, I am wondering at the units in the datasheet. Could you please clarify?

Regards,

Hugues Lepage

  • 0
    TI__Mastermind 27246 points

    Hi Hugues

    How did you measure the IEN ?

    Thank you

  • 0 in reply to Gui He
    Prodigy 10 points

    Hello Gui,

    See attached sketch. I simply measured the voltage at EN and calculated the current. Note that my prototype was modified quite a bit, therefore there might be leakage from another source. Before troubleshooting, I simply wanted to confirm that the units in the datasheet were right (I mean nA, not uA).

    Regards,

    Hugues

    Xerox Scan_20230727113820.pdf

  • 0 in reply to Hugues Lepage
    Prodigy 10 points

    Hello again Gui,

    As I mentioned, my prototype has a few modifications. Therefore I looked at the lower resistor (15k8) which was actually made with two 31K6 / 0402 in parallel with the microscope... one was cracked! Fixed it, and now works as expected. Using the same method as previous, I calculated IEN at 200nA. This is such a low current that it cannot be so accurate using the multimeter. Bottom line, the datasheet is good.

    Sorry for the inconvenience, and thanks for your prompt support.

    I’m closing this ticket.

    Regards,

    Hugues