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设计多相、大功率降压变换器的优点

消耗积分:0 | 格式:rar | 大小:0.10 MB | 2017-06-24

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  设计多相、大功率降压变换器的优点

  虽然单相降压控制器适用于低压转换器应用,其电流要求高达约25 A,但当负载电压低且电流要求较高时,功耗和效率开始成为一个问题。尤其是新一代高速处理器,其工作电压低于2 V,需要50 A或更高的处理数据。多相降压变换器有望解决这一问题。

  在这种应用中使用多相技术的主要好处是,它们提供更高的效率,从较低的过渡损耗,更低的输出纹波电压,更好的瞬态性能,以及较低的纹波电流额定值的输入电容器。

  一些电力半导体供应商开发了多相降压控制器,包括只需少量无源元件就能完成解决方案的集成解决方案。一些在这个空间的主要选手是国际整流器,Intersil,线性技术,集成产品、德克萨斯文书等等。

  设计多相、大功率降压变换器的优点

  Benefits in detail

  Texas Instruments has generated an application note¹ that describes some of the benefits in detail and provides a design example to demonstrate the outlined capabilities. A typical two-phase converter with associated multiphase controller is shown in Figure 1. The corresponding waveform for the two phases at respective nodes is depicted in Figure 2. As described in the application note, the two phases are interleaved, which reduces ripple currents at the input and output. In addition, interleaving also reduces hot spots on a printed-circuit board (PCB) or a particular component. In reality, a two-phase buck converter reduces the current (rms) power dissipation in the MOSFETs and associated inductors by half, thereby significantly cutting transitional losses to improve conversion efficiency.

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