1746-NR8參詳_廈門海通華業科技有限公司

1746-NR8參詳

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電源的電磁幹擾水平是設計中*難的部分，設計人員能做的*多就是在設計中進行充分考慮，尤其在布局時。由於直流到直流的轉換器很常用，所以硬件工程師或多或少都會接觸到相關的工作，本文中我們將考慮與低電磁幹擾設計相關的兩種常見的折中方案 [1] 。

電源設計中即使是普通的直流到直流開關轉換器的設計都會出現一係列問題，尤其在高功率電源設計中更是如此。除功能性考慮以外，工程師*須保證設計的魯棒性，以符合成本目標要求以及熱性能和空間限制，當然同時還要保證設計的進度。另外，出於產品規範和係統性能的考慮，電源產生的電磁幹擾(EMI)*須足夠低。不過，電源的電磁幹擾水平卻是設計中*難*確預計的項目。有些人甚至認為這簡直是不可能的，設計人員能做的*多就是在設計中進行充分考慮，尤其在布局時。

盡管本文所討論的原理適用於廣泛的電源設計，但我們在此只關注直流到直流的轉換器，因為它的應用相當廣泛，幾乎每一位硬件工程師都會接觸到與它相關的工作，說不定什麼時候就*須設計一個電源轉換器。本文中我們將考慮與低電磁幹擾設計相關的兩種常見的折中方案;熱性能、電磁幹擾以及與PCB布局和電磁幹擾相關的方案尺寸等。文中我們將使用一個簡單的降壓轉換器做例子。