• State TI Thinks Resolved
  • Locked Locked
  • Replies 18 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 433 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.

LMZ14203TZ-ADJ/NOPB

Daniel Luong
Prodigy 10 points 
Dear Team,

Have a nice day,
We are using LMZ14203TZ-ADJ/NOPB part of TI but we are having the proplem as this above:

Customer feedback IC PN: LMZ14203TZ-ADJ/NOPB  was NG detected in production process.
Detail: IC Out put voltage was out of spec.
Follow Simplified Application Schematic in Datasheet from MNF: With  Vin = 7.5- 42V,  Ron 100K ohm, Rfbb= 1.07kohm, Rfbt= 5.62 kohm => Vout = 5V  
But actual products  setup:  Vin =12V,  Ron 100K ohm, Rfbb= 1.07kohm, Rfbt= 5.62 kohm Vout = 0.1- 0.2 V => Out of spec => NG
NG quantity: 50pcs


Error and operation details are in the attached file.
Please help us check this error.
Please let us know if you have any information. Hope to hear from you soon.

    

Thank you so much
  • 0
    TI__Guru* 78300 points

    Hi Daniel,

    Thank you for posting.    If you copied the dahatsheet schematic and your design is in production, the IC may become damaged somehow.  Do you know the failure rate that the customer is seeing?  Does this failing only happen with on lot, or multiple lots?

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Dear Youhao, 

    Thank you for replying, currently error rate 95/600pcs. 95pcs error and 505pcs is ok.

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Do you have any solutions for this proplem?

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Hi Daniel,

    Honestly I don't have any clue at this moment.  Since the majority of the parts works well, and since you basically duplicated the datasheet example schematic, I would assume your circuit design is fine.  We need to investigate what is the root cause.  Let me check with our QA personnel and find how to proceed from here. 

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    yeah, please help us check soon and give us the answer.

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Hi Daniel,

    I consulted our QA engineer and he mentioned a possible cause which may lead to the your problem, that is the reflow profile and temperature. Did you follow the SMT guidelines in the datasheet? If the temperature is too high, the IC is subject to be damaged. Could you double check that with your production line?

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Dear YouHao,

    This is temperature cycle. pls help me check it. if you have any comments , please help me feedback soon. Thank you

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Dear YouHao,

    This is temperature cycle. pls help me check it. if you have any comments , please help me feedback soon. Thank you

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Dear YouHao,

    This is temperature cycle. pls help me check it. if you have any comments , please help me feedback soon. Thank you

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Dear Daniel,

     I think all your three latest posts are duplicates, right?   I am afraid your profile exceeded what is recommended in the datasheet, which I copy and paste below for your convenience.  

    Hope this clarifies.

    Best Regards,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Dear YouHao,

    Can you help us circle the points that exceed ( circle your photo and my photo) and send again for us ? we will compare and find reason.

    Thank you.

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Dear Daniel,

    If you see our datasheet chart, the temperature is always below 250C.  In your chart, your limits is set at 260C, and your recorded peak is 255.8C. I wish I could attach a snapshot to circle the areas, but somehow the e2e does  not allow me to attach.  Wish my description is clear enough?

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Guru* 78300 points

    Hi Daniel,

    Since there is no update from you side after more than two week, may I assume the issue is resolved and we can close this thread?  You can re-open it by adding a new post.

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Hello Youhao,

    After I were received your recommend, We set up the soldering furnace temperature as the setup for the white circuit board, without components and solder, after having the components and solder, the temperature at the component when going through the actual soldering furnace will be lower.We installed the sensor on the component body on the circuit board and ran it through the soldering furnace, the highest temperature on the component body when going through the soldering furnace was about 236 degrees, details according to the attached photo.

    We have installed a temperature sensor to test and found that the temperature is as shown in the picture.

    If you have any solutions, pls help us share it.

    Thank you.

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Hi Daniel,

    Honestly I am an electrical engineer and this needs to consult with an expert of manufacturing flows with PCBs.  I might be wrong, but you have achieved 135C and never exceed 245C, and this should be good enough?  If you want to get a little higher temperature, you may set your Oven max slight higher, or slow down the board travel speed inside the oven, and this can fine tune the temperature to what you want to achieve, right?

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    Prodigy 10 points

    Hello Youhao,

    Good day,

    if we send error IC for you, can you support to analysis error cause and feedback for me?

    Thank you

  • 0 in reply to Daniel Luong
    TI__Guru* 78300 points

    Hi Daniel,

    Good day.  Please do not ship the unit to me because I will be out of office for the rest of this month.  I am contacting our manager to find how to support this.  Please wait for the update.

    Best Regards,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Guru* 78300 points

    Hi Daniel,

    I just recall that when you want to return the device to TI for analysis, you should follow the procedure described at the following link.  Please do so and this will be guided directly to the right personnel. 

    http://www.ti.com/support-quality/resources/customer-returns.html

    Best Regards,

    Youhao