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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th September 2010, 08:20 AM   #11
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Quote:
Originally Posted by Sch3mat1c View Post
Why?

It makes placing SMTs much easier.

Tim
You did a good layout of the components, I understand that you did not cover (color solder) so as not to oxidize the copper, in this case you can use transparent color spray to protect (only has 2 pF / cm).
tin has a high electrical resistance (very poor conductor) compared to copper, it is known that electrons propagate in the surface of the conductor (not in).
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Old 8th September 2010, 03:37 PM   #12
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Ah, but the surface that's carrying the most current is the *inside* surface, because the same current (give or take) appears as an image on the ground plane, on its inside surface as well. For a 2oz board, skin effect starts taking effect above 1MHz, and the plating won't matter until 10MHz (remember, the skin depth in solder is deeper than in copper, so it is still deep enough to reach the copper anyway). Harmonics past 100MHz in this circuit carry negligible power. For that matter, I don't *want* harmonics that high, they're an EMC hazard. If tinned boards help reduce RFI, it's a good thing!

Tim
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