• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 2 answers
  • Subscribers 64 subscribers
  • Views 150 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.

Original question:

TPS92629-Q1: Ground fault mode

TPS92629-Q1: Test Result of AEC-Q100-012

Masaru Oinaga
Expert 4425 points
Part Number: TPS92629-Q1
Other Parts Discussed in Thread: TPS92629Q1EVM

Tool/software:

Hello, Team,

Our customer is requesting below two things:

  1. A result of AEC-Q100-012 (ground-short tolerance test) with its test grade. We could not find the result in below page:
    https://www.ti.com/quality-reliability-packaging-download/report?opn=TPS92629QDGNRQ1
  2. What is the failure mode related to AEC-Q100-012? If it does not fail, what would be the worst case and expected failure mode?

Best,
Masaru

  • +1
    TI__Genius 11765 points

    Hi Masaru,

    From my understanding the AEC-Q100-012 standard is directed towards power switches, not high-side drivers.

    The TPS92629-Q1 has integrated short-to-ground fault detection in which the current is disabled if the output channel is shorted to ground. Please refer to section 7.3.6.1 in the datasheet for more information. 

    Figures 6-21 and 6-22 show measured results of LED short-protection and auto-recovery features.

    Regards,

    Zach

  • 0 in reply to Zach Olson
    TI__Expert 4425 points

    Hello, Zach,

    We shared your comment and got new question. What our customer would like to know is whether TI does a short-to-ground test similar to AEC-Q100-012 on  the short-to-ground fault detection. Do we have test results other than the one provided in the datasheet which we can share it to our customer?

    Best,
    Masaru

  • 0 in reply to Masaru Oinaga
    TI__Genius 11765 points

    Hi Masaru,

    The short-to-ground test result provided in the datasheet should be close enough to the standard. We can always sample a TPS92629Q1EVM for the customer to verify the short-to-ground fault protection. We have jumpers populated on the EVM specifically for this type of short test. 

    https://www.ti.com/tool/TPS92629Q1EVM 

    Regards,

    Zach

  • 0 in reply to Zach Olson
    TI__Expert 4425 points

    Hello, Zach,

    If they test the short-to-ground fault protection multiple times, how many times can the IC withstand? Also, when the IC gets malfunctioned, what would be the failure mode?

    Its the question I asked in the original post as below:

    Masaru Oinaga said:
    1. If it does not fail, what would be the worst case and expected failure mode?

    Best,
    Masaru

  • +1 in reply to Masaru Oinaga
    TI__Genius 11765 points

    Hi Masaru,

    There is no limit to the number of times the output can be shorted to ground. The device is a constant current source, and is capable of sourcing a constant current into any load including directly ground. The internal short-to-ground detection is typically used as a diagnostic tool, and to protect other system elements during a short-circuit event.

    You may refer to the FAULT table (section 7.3.8 of the datasheet) for more information on fault handling.

    Regards,

    Zach

  • 0 in reply to Zach Olson
    TI__Expert 4425 points

    Hello, Zach,

    Additional question: does TI implement some kind of test at AT with respect to these protection features? Or, is it only tested by the criteria which is given in the below "Quality, reliability and packaging data"?:

    https://www.ti.com/quality-reliability-packaging-download/report?opn=TPS92629QDGNRQ1

    Best,
    Masaru

  • 0 in reply to Masaru Oinaga
    TI__Genius 11765 points

    Hi Masaru-san,

    Unless otherwise noted, all TI devices are tested at AT to ensure the device specifications as shown in the electrical characteristics section of the datasheet.

    Regards,

    Zach