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TLV62085: [D1COMPANY] Product design inquiries

Kayla HAN
Prodigy 40 points
Part Number: TLV62085


Tool/software:

Hello,

This is Kayla from D1COMPANY in Korea.

I'd like to ask you some questions about items-TLV62085RLTR- I ordered.

Please see the picture below. left one is TI datasheet application and the other(right) is our design.

1. I know I should floating process if don't use PG according to datasheet guide. Is there any problem if I go process to 100K pull-down like figure(right) below?

2. EN should tie with VIN power, but is there any problem if I use Pull-up resistance like figure?

3. Would there be no problem in the low-temperature test if it was designed like 1,2 above?

  • 0
    TI__Expert 7280 points

    Hi Kayla,

    Thanks for using E2E.

    1. You can use the Pull-down on the PG output, no issue.

    2. The Pull-up resistor on the EN pin is also fine.

    3. I don't see any problem at low temperature with you schematic.

    Best regards,

    Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 40 points

    Dear Josef,

    Thanks for your quick reply.

    I have a question of same item -TLV62085

    Please see the below picture. It is our test result.

    A (left) and B (right) are the same products and I ordered them on the same day, but the test results are different.

    Is the reason A is different from B because the product is defective? Is it because the chamber temperature is low?

    I wonder if the product A is defective or not.

  • 0 in reply to Kayla HAN
    TI__Expert 7280 points

    Hi Kayla,

    Please provide the original scope plots for the abnormal behavior. What are the 3 curves representing?

    Could you please check if the unit A is soldered correctly and put the device on a different board and check the behavior again.

    Best regards,

    Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 40 points

    Hi Josef,

    Please refef to the answer below. :)

    1. Please provide the original scope plots for the abnormal behavior.

    => Please see the B picture for the data value when it is normal.

    If you want a big picture when it's abnormal, please refer to the picture below.

    2. What are the 3 curves representing?

    => Green : Please ignore it

    Yellow : Unit A (TLV62085)_INPUT 5V

    Pink : Unit A (TLV62085)_OUTPUT 1.8V

    3. Could you please check if the unit A is soldered correctly and put the device on a different board and check the behavior again.

    => There is no board to replace the TLV62085 product.

  • 0 in reply to Kayla HAN
    TI__Expert 7280 points

    Hi Kayla,

    Do you have seen this behavior on more than 1 unit? Is this happening after startup only?

    Best regards, Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 40 points

    Hi Josef,

    1.  Do you have seen this behavior on more than 1 unit?

       => This occurred in 1 out of 8 cases.

    2.  Is this happening after startup only?

       => This occurs after first turning on the power at chamber temperature -40.

            This symptom disappears when the board heats up after turning it on.

  • 0 in reply to Kayla HAN
    TI__Expert 7280 points

    Hi Kayla,

    I have checked a lot of data but I have never seen a behavior like this.

    Please contact your local TI support team for sending back this fail unit for analysis.

    Best regards,

    Sepp