• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 62 subscribers
  • Views 270 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.

TPS23730: Updated Reference Design recommend...

Christian Heidbreder
Prodigy 40 points
Part Number: TPS23730
Other Parts Discussed in Thread: TIDA-050045

Hello,

your reference schematic looks like a alpha version. The transformer T2 is for example not really connected:

 

Also the diode D24 should make the connection between VSS and PGND, but the diode is not mounted...

And I can't find any other connection between VSS and PGND. How should it works? Or should the Diode D24 replaced by a 0R Resistor / short circuit?

In the reference Design from TPS23730EVM-093 it looks not much better. The diode D24 is there also not mounted. In the Layout guidelines is written:

Place the Schotty diode between VSS and RTN as close to the IC as possible, preferably on directly on the
opposite side of the board (ex. The TPS23730EVM-093 places the IC on the top side, so the diode is on the
bottom side directly underneath it).

(RTN is connected to PGND)

In the reference Layout is on this position is only a Diode D23:

Top side         Bottom side   

Could it be, that you have here not published the final versions?

Best regards - Christian Heidbreder

  • 0
    TI__Mastermind 21320 points

    Christian, 

    Thanks for the transformer feedback.

    Yes we know D24 is not mounted, that is intentional... it is also intentional that there are no other connections between VSS and RTN. That would short the internal pass FET and therefore prohibit in-rush current limiting and adapter priority.. Why are you asking to connect these two pins?

    D24 is there to protect during surge and ESD. 

    I think part of your confusion is that you are pulling  the schematic and the layout from different designs. The layout file is to TPS23730EVM-093, and the schematic is for TIDA-050045. The TIDA-050045 layout files are in the TIDA-050045 Design Files -- please see TIDA-050045 PCB page 6 directly underneath the IC.

    You can always order a board for evaluation. 

     

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Prodigy 40 points

    Hello Michael,

    thanks for the answer.

    If the diode D24 is for ESD and surge protection, then the diode should be mounted in the final application...

    In my eyes TIDA-050045 (5V 10A) and TPS23730EVM-093 (12V 5A) have the same schematic and layout, only the BOM is different. And on the photos from TPS23730EVM-093 (also shown in TIDA-050045 project) is mounted a LinkCom LDT8627 instead a Würth transformer like in the schematic & BOM, so maybe we get another  behaviour and also a different BOM.

    My suggestion is that all design resources should matching each other. Otherwise it looks not like a round design and the customers are faster willing to search for alternative products... 

  • 0 in reply to Christian Heidbreder
    TI__Mastermind 21320 points

    Christian, 

    Thanks for the feedback. Is there anything that I can help you with for these designs?

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • +1 in reply to Christian Heidbreder
    TI__Mastermind 21320 points

    I will add the TIDA-050045 performance is as indicated in the test report. You are more than welcome to order a design and verify the results for yourself. Thanks!