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.

PMP10215: Gerber footprint for T2 in reference design doesn't accommodate the transformer!

Part Number: PMP10215

Hi there,

After many weeks, and lots of money, we were completing assembly of the PMP10215 reference design today and found that the PCB footprint for T2 doesn't accommodate the transformer!  What can we do?  

We have the Transformer from the BOM:  Wurth Electronik 7508110338.

And had the PCB's manufactured using the Gerber's on your website. 

If you look at the footprint for the transformer here:  https://www.we-online.de/katalog/datasheet/7508110338.pdf   You'll see that one side is different.

The PCB has a different footprint:  https://www.ti.com/lit/df/tidrlm4/tidrlm4.pdf?ts=1624075272463&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FPMP10215

Can you please help us modify the PCB or change the T2 part so we can finish the design?

Thank you for your assistance!

  • Hello Mark,

    After uploading, in the past, this reference design, we put in the schematic the note that this transformer has to be adapted slightly to the existing PCB (pretty easily I would say: see attached revision E of the schematic, while the online version is revision D). In this latest revision E, we added also a circuit that, during the Vout set point switching, from 18V to 36V and back, the Vout slope is limited, and this avoids any overshoot nor overcurrent in the converter. You may want to add this or not, as you prefer. Of course, if you add it, please consider that these components (Q103, Q102 and passive) are not on the original PCB, so they should be added externally.

    I also added the revision D BOM FYI.PMP10215 Rev_E Project.pdfPDS BOM-PMP10215 Rev_E Project.xls

    Best regards,

    Roberto

  • Hi Roberto, thanks for the advice regarding the updated schematic.  I'm assuming that our board should work properly based on the Gerbers and Schematic that are currently available on your website?

    I was able to bend pins 7 & 8 and could JUST get them into the holes to solder.  However I had to remove unused pins 6 & 9.  Is this OK?

    Many thanks!

  • Hi Mark,

    Yo are right: the board should work properly based on the Gerber files available on our website; in the latest schematic I sent you there are few useful recommendations (for example, to rise 0.5mm - 1mm the heat sinks, otherwise they can touch the tracks on top side of the PCB). The work you made to adapt the transformer is perfect!

    Regards,

    Roberto

  • Excellent.  Thank you again for your support, Roberto!