電感器在完成基于功率模塊的解決方案中的作用

　　電子元件制造商在整合開關DC-DC變換器的離散元件，取得了巨大的進步（‘regulator”）為一個模塊。然而，有些人還沒有完全完成這項工作。電感是調節器拓撲的一個關鍵部分，通常需要作為外部元件來添加。

　　這是因為線圈不容易縮小到其他部件的小型化。盡管如此，一批選定的硅供應商已經面臨挑戰，一些新的設計，使電感器“從冷”，現在可用。

　　本文介紹了電感器的作用，并考慮了為什么難以將其包括在模塊化封裝中。本文將引導來看看電源模塊制造商如線性技術，Intersil，三角洲已經解決的問題，在其最新的電源包（PSIP）設計。

　　Not quite total integration

　　Integrating the constituent parts of switching regulator makes a lot of sense. Time-to-market， overall cost （design time plus components）， size constraints， reliability， and low noise are among the advantages of a modular versus a discrete regulator design （see previous Power TechZone article）

　　Manufacturers such as Fairchild， Maxim， and Texas Instruments have reacted to market demand by introducing a slew of modular power supplies that make it comparatively easy for a designer to add a regulator to his or her latest product.

　　However， devices such as Fairchild’s FAN8303 buck regulator （Figure 1） or Maxim’s MAX8625A buck regulator are not totally integrated. The inductor （Figure 2）， a component that has stubbornly disobeyed Moore’s Law and remained bulky， is not included in the package. The designer is left to chose a device， find space for it on the board， and connect it to the power supply module. Often that is not a problem， but there are other occasions when this is far from ideal.