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Some questions about the PCBs exported from Webench

Itachi Uchiha
Intellectual 285 points
Other Parts Discussed in Thread: LM3488, LM25088

Hi engineers,

I have used Webench to export some PCBs for power controllers like LM3488, LM25088, ...Here are some questions I'd like to ask about the exported PCBs.

1. The distance between polygon copper pours is a little too thin

Please have a look at this:

https://www.dropbox.com/s/c78dttev4swc6vr/pic_1.png?dl=0

Some distances are only as small as 0.254 mm. This is smaller than the recommended distance found in the example layout in the datasheet of the device. Is this a problem?

2. There are some redundant lines in the exported PCBs

Please have a look at this:

https://www.dropbox.com/s/ml2nfyj4pldxstf/pic_2.png?dl=0

Is this a bug of the tool?

Thank you very much for visiting my topic.

  • 0
    TI__Expert 6365 points

    Hello Uchiha-San,

    Thank you for your support of using Ti's WEBENCH tool.

    For q1: It's required to re-pour the polygons after importing the PCB into the native cad tool. The polygon clearances are adjustable in the native tool; however, the default setting of 10 mil minimum spacing is still within the design rules given that the fabricated PCB is coated.

    For q2:  Not a bug, the residual tracks are kept in the layout for translation but it should not be any issue given the polygons pour covers therm. 

    I hope I have addressed your questions.  Please use the WEBENCH shared design link to be more convenient for us to access the designs. I don't have access to Dropbox and it's too much hassle to have one.