Re: Ground and Ground plane on 2 layer board

Here is a link from National Semicondutor's website on layout switcher
supplies. Note how single point grounding is used.

www.national.com/appinfo/power/files/national_power_designer114.pdf


Rich Grise wrote:
On Fri, 05 Jan 2007 01:45:04 -0800, Liuc wrote:

My question is: how to use the ground plane? I've read plenty of threads
about it, but I didn't fully understand which is the best way to do. My
doubts are mainly about:

There aren't really any hard and fast rules - one thing to keep in mind is
current paths. Current always flows from the power supply through the load
(your circuit) and back. When you're laying out your power supplies and
parts, visualize which copper will have the current flowing from and to
the supply, and try to minimize the interaction between those current
flows for different supplies. I think this is the idea behind the "single
point" or "star" ground. If you watch your layout, that shouldn't be
necessary. Where is the current flowing is what you need to watch.

Also, I've always said you can't overcapacitate. 10uF or more at the power
entry point and a .1 ceramic (or more, depending on power/ground pins) at
each chip has always worked for me. :-)

Good Luck!
Rich

.

Relevant Pages

  • Re: OT: Powersupply For P5W DH
    ... Would you recommend than looking for supplies that can pull more amps on the ... 12v rail than a triple or quad with 19/20amps per output? ... I am going to see if I can dig up any info on that power supply. ... The PCI Express x16 slot connector is generally used ...
    (alt.comp.periphs.mainboard.asus)
  • Re: OT: Powersupply For P5W DH
    ... Would you recommend than looking for supplies that can pull more amps on the ... I am going to see if I can dig up any info on that power supply. ... output rail. ... The triples and quads also look to be usable solutions. ...
    (alt.comp.periphs.mainboard.asus)
  • Re: P4P800se - what is it with this board?
    ... It seems to be a PSU problem, I have changed my 300W PSU with a 550W ... issues with Antec Truepower supplies, and the problem was corrected in subsequent production by changing some component ... A port 80 POST card used to cost $100, ... In terms of buying a good power supply for your computer, ...
    (alt.comp.periphs.mainboard.asus)
  • Re: S-100 prototype boards
    ... backplanes, power supplies, prototyping boards, and design libraries ... bus, where to put the power supply, will vary. ... Buying an old S-100 chassis is really a bargain, in my opinion, ... regulators to get a few more volts, ...
    (comp.os.cpm)
  • Re: problems with Vicor VI-200 dc-dc modules?
    ... dual output supplies built with their VI-260-IY modules for dual 5 VDC ... $20,000 radios still in warranty, and just out of warranty were having ... with their lowest power rating, ... They were part of Vicor built power supplies. ...
    (sci.electronics.design)