rebel LED package

Dear Chuck

I followed your instructions. And added a small example. Is this the right

way to do it? Aren't the via's filled with solder during the reflow process?

Do you also have any idea why it's possible that the via's in the board are

bigger than those in the package design??

Thanks

Mark

"Chuck Huber" <chuck.huber@dukepro.com> schreef in bericht

news:fpcb7u$m9$1@cheetah.cadsoft.de...

M.Klaassens wrote:

Hi,

 

I designed the footprint, as attached. But now I want to connect all

via's to the V(ia)-pin. Anyone any suggestions?

 

I ran across this problem with a PCB mounted fuse clip designed to accept

one end of a cylindrical fuse.  The clip has two pins on the same net.

 

At present, there is no way to connect multiple plated through-holes to

the same pin in the schematic - it's always a one-to-one relationship

between pads/holes in the package and pins in the schematic.

 

To work around this, I created the part with some copper on the bFill

(layer 101) layer and included that layer with the top copper in the .cam

file.  This avoids all the DRC errors produced when you have bottom copper

bridging both pins.

 

In my application, I have a 70 to 90 amp impulse lasting about 2.5 to 3.0

us going through the part.  I wanted to make sure that all the holes were

connected to copper to reduce inductive and IR impedence losses.

Basically, the current traveling along the trace had to turn "up" to get

to the clip.  This amounts to a 1/4 turn inductor.

 

 

In the case of the Rebel LED package, you may want add a polygon on the

tFill (101) and bFill (102) layers that surrounds all the vias.  Be sure

to modify you CAM file to include tFill with the top copper and bFill with

bottom copper.  On the schematic, you can have one pin connected to one of

the vias.

 

When you produce the gerber files, double check the top and bottom copper

layers to make sure the fill has been included.

 

While it's not the ideal approach, it is a decent workaround that will get

you copper where you need it.

 

Hope this helps,

 

    - Chuck

Dear Chuck

I followed your instructions. And added a small example. Is this the right

way to do it? Aren't the via's filled with solder during the reflow process?

Do you also have any idea why it's possible that the via's in the board are

bigger than those in the package design??

Thanks

Mark

"Chuck Huber" <chuck.huber@dukepro.com> schreef in bericht

news:fpcb7u$m9$1@cheetah.cadsoft.de...

M.Klaassens wrote:

Hi,

 

I designed the footprint, as attached. But now I want to connect all

via's to the V(ia)-pin. Anyone any suggestions?

 

I ran across this problem with a PCB mounted fuse clip designed to accept

one end of a cylindrical fuse.  The clip has two pins on the same net.

 

At present, there is no way to connect multiple plated through-holes to

the same pin in the schematic - it's always a one-to-one relationship

between pads/holes in the package and pins in the schematic.

 

To work around this, I created the part with some copper on the bFill

(layer 101) layer and included that layer with the top copper in the .cam

file.  This avoids all the DRC errors produced when you have bottom copper

bridging both pins.

 

In my application, I have a 70 to 90 amp impulse lasting about 2.5 to 3.0

us going through the part.  I wanted to make sure that all the holes were

connected to copper to reduce inductive and IR impedence losses.

Basically, the current traveling along the trace had to turn "up" to get

to the clip.  This amounts to a 1/4 turn inductor.

 

 

In the case of the Rebel LED package, you may want add a polygon on the

tFill (101) and bFill (102) layers that surrounds all the vias.  Be sure

to modify you CAM file to include tFill with the top copper and bFill with

bottom copper.  On the schematic, you can have one pin connected to one of

the vias.

 

When you produce the gerber files, double check the top and bottom copper

layers to make sure the fill has been included.

 

While it's not the ideal approach, it is a decent workaround that will get

you copper where you need it.

 

Hope this helps,

 

    - Chuck