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changing thermal PADs for LED's

mike111

I'm designing an aluminium single layer board with multiple high power LED's. I use an aluminium board for cooling these powerful LED's. I want to make the thermal PAD for the LED's bigger than the PAD in the library. Because I use quite a large number lot of LED's and the surrounding of each LED is different I cannot change the library model, but have to change each PAD individually. But because the thermal PADs are not electrically isolated I cannot make a ground plane to put them on as I did with other types. Is there a trick to easily pour some copper on these pads? Or is there another solution to make the PADs bigger in Eagle light?

Thanks!

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    On 10/12/2011 06:23 AM, mike111 wrote:

    I'm designing an aluminium single layer board with multiple high power LED's. I use an aluminium board for cooling these powerful LED's. I want to make the thermal PAD for the LED's bigger than the PAD in the library. Because I use quite a large number lot of LED's and the surrounding of each LED is different I cannot change the library model, but have to change each PAD individually. But because the thermal PADs are not electrically isolated I cannot make a ground plane to put them on as I did with other types. Is there a trick to easily pour some copper on these pads? Or is there another solution to make the PADs bigger in Eagle light?

    Thanks!

     

    Use a small polygon around the pad and name it the net name of the pad.

    You can turn thermals off on that polygon. You may also need to use rank

    for overlapping cases. See help rank.

     

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  • 0

    On 10/12/2011 06:23 AM, mike111 wrote:

    I'm designing an aluminium single layer board with multiple high power LED's. I use an aluminium board for cooling these powerful LED's. I want to make the thermal PAD for the LED's bigger than the PAD in the library. Because I use quite a large number lot of LED's and the surrounding of each LED is different I cannot change the library model, but have to change each PAD individually. But because the thermal PADs are not electrically isolated I cannot make a ground plane to put them on as I did with other types. Is there a trick to easily pour some copper on these pads? Or is there another solution to make the PADs bigger in Eagle light?

    Thanks!

     

    Use a small polygon around the pad and name it the net name of the pad.

    You can turn thermals off on that polygon. You may also need to use rank

    for overlapping cases. See help rank.

     

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