电源排序简化设计要点

　　设计多轨电源时，每增加一个电源轨，挑战都会成倍增加。设计师必须考虑怎样动态协调电源排序和定时、加电复位、故障监视、提供恰当的响应以保护系统等方方面面。有经验的设计师都知道，随着项目从原型向生产环境转变，成功应对这种动态变化环境的关键是灵活性。

　　Introduction

　　Designingamultiplepower supplysystemis challenging. The power supply designer’sworkloadmultiplies with each additional supply rail. The designer must consider the dynamic environment of coordinated power supply sequencing and timing， generating power-on reset， monitoring forfaults and responding appropriately to protect the system. An experienced designer recognizes that flexibility is key to successfully navigating the ebb and flow as a project moves from prototype to production. The ideal solution minimizes the number of hardware and software changes during development.

　　The ideal multisupply design tool is a single IC that resides in a design from beginning to end， requiring no wiring changes through the life cycle of the product. It autonomously supervises and sequences multiple power rails， cooperating with other ICs to seamlessly supervise many power regulators in the system， and provides fault and reset management. The designer can use powerful PC-based software to configure， visualize and debug system behavior in real time when connected to an I 2C bus