[SI-LIST] : Bulk Caps -> Inductor? -> Plane

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From: mjs ([email protected])
Date: Tue Apr 11 2000 - 11:58:33 PDT

I am not sure if the list accepts attachments, but here goes.
If the attachment is stripped by the listserve, please find
it visible at www.enteract.com/~mjs/induct.gif (16k)


The attached gif show a snip from a schematic currently in layout.

The transformer shows the secondary of the SMPS, connected to a whole mess of bulk capacitance, especially on +5V net.

Please note L202 series inductor inserted between the bulk capacitance and the connection to the power plane. This worries me most. There seems to be no valid reason to stuff series inductance between the bulk and the plane. Further, all the local ceramic IC pin bypass will also have to suck current through that same inductor. Seems like a terrible idea to me. Comments welcome.

Matt Stanik Sr. PCB Design Eng. Charles Industries, Ltd.


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