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DRV8145-Q1: Confirm about how OLP is handled

Masaru Oinaga
Expert 4365 points
Part Number: DRV8145-Q1

Tool/software:

Hello, Experts,

We have question about OLP of DRV8145-Q1:

  • Our customer thinks that they cannot distinguish between the short of internal SW (circled in red) vs internal FET. Is this correct understanding?
  • IF yes, is there a way to distinguish between them? 
    • We thought the description in the datasheet would be helpful (p37):
      "• The user is expected to toggle through all the combinations and record the comparator output after its output is settled. "
      "• Based on the input combinations and comparator output, the user can determine if there is a fault on the output."

Best,
Masaru

  • +1
    TI__Mastermind 24080 points

    Hi Masaru,

    Masaru Oinaga said:
    cannot distinguish between the short of internal SW (circled in red) vs internal FET. Is this correct understanding?

    This is correct. These switches are used to pull up or down the OUT node for the OLP diagnostic. If the voltage on the OUT node does not get pulled up or down correctly this indicates a short or open on the OUT node.

    If one of these switches were to remain closed or open when they should not be, this would still report as a fault on the OUT pin.

    Masaru Oinaga said:
    IF yes, is there a way to distinguish between them?

    Could I know why the customer would like to be able to distinguish between the FET or switch being shorted? 

    Regards,

    Joshua

  • 0 in reply to Joshua Horlander Cruz
    TI__Expert 4365 points

    Hello, Joshua,

    We shared the GUI you sent us to our customer and waiting for their feedback. We will post another thread when we get their feedback.

    Best,
    Masaru

  • 0 in reply to Masaru Oinaga
    TI__Mastermind 24080 points

    Hi Masaru,

    Sounds good! If the customer has any feedback with the GUI in terms of bugs or general recommendations, please let me know, we are updating the GUI at this moment so all any feedback is appreciated.

    Regards,

    Joshua