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PierreBTOL
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re: Understand and reduce DC/DC switching-converter ground noise
PierreBTOL   11/23/2011 12:10:38 PM
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Concise & very interesting ! If we could have the same level of explications about the "i/o CommonMode Noise Isolated" DCDC Converter, it will be great !

agk
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re: Understand and reduce DC/DC switching-converter ground noise
agk   11/22/2011 10:36:51 AM
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The inductor can be made with minimum parasitic capacitance. The bobin of the inductor to have corrugated sections and the wire is wound in these sections will reduce the parasitic capacitance very much. In turn can minimize the ground noises.

abraxalito
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re: Understand and reduce DC/DC switching-converter ground noise
abraxalito   11/22/2011 4:41:10 AM
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Very interesting - but the enlarged drawing links appear to be broken on this page. Second the request for more similar articles, this is first-principle stuff so has wide applicability beyond DC-DC converters.

_hm
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CEO
re: Understand and reduce DC/DC switching-converter ground noise
_hm   11/22/2011 12:36:04 AM
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Interesting and informative article. Can there be webinar from Author and link available on eetimes?

zeeglen
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re: Understand and reduce DC/DC switching-converter ground noise
zeeglen   11/21/2011 7:56:16 PM
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Good article, and also would like to see more. Years ago I ran into a problem with noise from an isolated 48V to 5V converter into a fiber optic receiver, but only when the card was placed into a metal card cage. On the bench alone it worked fine. The local ground noise was common mode in the optical receiver PIN diode to the external transimpedance amplifier connection on the bench, but the metal optical receiver housing was physically installed on the card front faceplate. Placing the front faceplate at earth (chassis) ground capacitively quieted the local ground, which then caused a 3dB worse bit error rate. We ended up having to mount the optical receiver diode on the pcb and run an optical pigtail to the front faceplate connector. On a subsequent optical receiver I anticipated the problem and used a pigtail in the initial design as well as including mounting holes for a shield for the the optical receiver diode. The shield was needed, the card was stand-alone in a metal box and installing into the box caused similar converter noise problems. All that was needed was a square inch of metal on a couple standoffs at pcb ground to hide the photodiode and transimpedance input from the box.

Sanjib.A
User Rank
CEO
re: Understand and reduce DC/DC switching-converter ground noise
Sanjib.A   11/21/2011 6:17:55 PM
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Very good article. I am going to apply the learnings into the power supply design I got involved in. I would love to see a continuation of this series for other power supply topologies as well.

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