熱放散におけるメタルコアPCBの銅層の役割は何ですか?

I doubt it makes much difference unless the copper extends beyond the contact that would exist with the dielectric.

If the copper extends, you’ll have better lateral heat spreading and that will conduct through the dielectric so there will be less temperature drop across the dielectric.

Copper conducts heat about 400x better than the dielectric (which may be 50-200um thick) and is typically 35 or 70um thick (1oz/2oz). So extending it at least a few mm should help a little. I’m not sure it’s a huge difference, even at 200um and 1.0 W/m*K the temperature drop at (say) 5W is less than 7°C if I did the sums correctly (10mm x 15mm contact). If a 15 x 20mm pad was isothermal (which it won’t be but say it was a bit bigger than that), then it would reduce the drop to half, saving a few °C. The savings would be proportionally less (or worse) if the dielectric was thinner, so it might not be much.

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オリバーは、PCB 設計に熟練した経験豊富なエレクトロニクスエンジニアです。, アナログ回路, 組み込みシステム, とプロトタイピング. 彼の深い知識は概略図のキャプチャに及びます, ファームウェアコーディング, シミュレーション, レイアウト, テスト, そしてトラブルシューティング. オリバーは、電気設計の才能と機械の適性を活かして、プロジェクトをコンセプトから量産まで進めることに優れています。.