电感器在完成基于功率模块的解决方案中的作用
电子元件制造商在整合开关DC-DC变换器的离散元件,取得了巨大的进步(‘regulator”)为一个模块。然而,有些人还没有完全完成这项工作。电感是调节器拓扑的一个关键部分,通常需要作为外部元件来添加。
这是因为线圈不容易缩小到其他部件的小型化。尽管如此,一批选定的硅供应商已经面临挑战,一些新的设计,使电感器“从冷”,现在可用。
本文介绍了电感器的作用,并考虑了为什么难以将其包括在模块化封装中。本文将引导来看看电源模块制造商如线性技术,Intersil,三角洲已经解决的问题,在其最新的电源包(PSIP)设计。
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.
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