由於電子產品的設計朝向輕、薄、短、小且多功能發展，使得產品的功耗與功率密度相對增加。在使用多種的產品功能的同時，也代表所需負載的變化量變大，特別是使用通訊網路功能。電源管理晶片的發展因為高轉換效能的技術已經趨於飽和，逐漸朝向能快速響應與提高功率密度發展。一方面電源管理晶片必須依照系統負載需求提供穩定輸出電壓，才能夠使系統能正常工作；另一方面，電子產品體積逐漸縮小，電源管理晶片必須在有限的佈線面積內使用最少的零件數來符合系統需求。因此電源管理晶片具有快速的暫態響應與減少使用零件數的功能成了相當重要的課題。
本論文設計一個具有快速暫態響應輸出漣波電壓控制降壓轉換器，同時也具備了使用零件數少的優點。其中提出以偵測輸出電壓的變化來調整操作頻率，電路取得輸出電壓的變化，適當調整功率電晶體導通週期來調節輸出電壓位準及提升負載調節度。論文中晶片的工作電壓範圍為2.5V~4.6V，操作頻率為1MHz，提供1V的輸出電壓，在外部電感為1.2uH以及外部電容330uF情況下，可供應負載範圍0.01A~1A，輸出電壓的漣波大小為10mV、輸出電壓誤差1%的降壓式轉換器並針對電路提出一套設計流程來完成電路的模擬。因此可以確保在合宜元件及參數下，提出符合應用規格所需之最佳化電路設計。因此依上述之轉換器與設計流程，完成了一個有快速響應、零件數低以及最佳化參數值，來滿足系統功能的增加並提高功率密度。

As designs of portable electronic products are developed toward being light, thin, short, small and multi-functional, making the power consumption and power density of the products are relatively increased. While using a variety of product features, it also represents that a large amount of load changes is required, especially when using communication network functions. The development of power management chips have become saturated because of the technology of high conversion efficiency, and gradually develop toward the rapid response and high power density. On the one hand, the power management chip must provide a stable output voltage in accordance with the requirements of the system load to make the system work; on the other hand, the size of electronic product gradually reduced; the power management chip must be limited in the wiring area with the fewest of parts to meet system requirement. Therefore, how to make the power management chip with functions of fast transient response and to reduce the number of parts used has become a very important issue.
In this study, a ripple voltage control buck converter with fast transient response output was designed, and it also has the advantage of using fewer parts. We proposed that by detecting the changes of output voltage to adjust the operating frequency, adjust the circuit to obtain the output voltage changes, and adjust the power transistor conduction cycle appropriately to tune the output voltage level and enhance the load regulation. The operating voltage range of the chip is 2.5V ~ 4.6V, the operating frequency is 1MHz and the output voltage is 1V. When the external inductance is 1.2uH and the external capacitance is 330uF, the chip is able to supply a buck converter with load range 0.01A ~ 1A, the Ripple size of output voltage 10mV, and 1% of the output voltage error, and in the study we also proposed a set of circuit design process to complete the circuit simulation. It is therefore possible to ensure that the optimum circuit design is required to meet the applicable specifications under suitable components and parameters. Therefore, according to the converter and the design process described above, a chip with a fast response, low number of parts and optimized parameters are completed to meet the need of increase in system function and power density.

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