• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 122 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.

TPS7A16: output voltage drop

Hale Tan
Intellectual 2480 points
Part Number: TPS7A16

Hi, team!

There is a question about TPS7A16  voltage output drop.

We gave the TPS7A16 an input voltage of 6V and expected output voltage was 3.3V, but  the output voltage only remained for about one second, then dropped(input voltage was still 6V). Input current is about 1.15mA when it works normally.

I took a photo about output voltage. The blue is output voltage(2V/div) and Input current is green but it's too small to test. Others are not used.

 

You can see that the output voltage was about 3.3V at first, then skipped to 5V and dropped to 2V finally.

So I think current was not the reason to cause voltage drop. So could you explain the cause of the phenomenon?

  • 0
    TI__Genius 16606 points

    Hey Hale,

    I have a couple questions before I can definitively say this is a thermal issue. 

    1. Was the current probe connected backwards, or is the current flowing into the device?

    2. Are there external heatsinks on your board?

    3. What current are you trying to push before the part falls out of regulation - is this also 1.5mA?

    4. Can we see a scope shot for VIN?

    5. Does the part regulate after this happens? (e.g. does the part regulate when you take off the load or is it permanently damaged)

    6. Would you be able to take a thermal imaging picture of your board during regulation?

    Best,

    Juliette