具改善負載調節與快速暫態響應之直流-直流降壓轉換器設計

The Design of DC-DC Buck Converters with Improved Load Regulation and Fast Transient Response

許瑞軒(Jui-Hsuan Hsu)

指導教授 ： 陳建中 ； 黃育賢

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2010年)

摘要

本論文的第一個部份提出改善負載調節之降壓轉換器，採用TSMC 0.35μm 2P4M CMOS製程實現，晶片面積為1.572 ×1.589 mm2(含PADs)。所提出的電路加入了前饋式設計，藉由感測功率電晶體上的負載電流來改善輕載到重載輸出電壓準位，進而改善負載調節並且在效率上有好的表現。實驗結果顯示當負載電流為200mA時有最大效率94%。當負載變化從0mA至400mA時的負載調節為6.22(ppm/mA)。當輸入電源電壓為3.6V，此轉換器可精確提供輸出電壓範圍從1V到3V。
本論文第二部份為快速暫態響應單電感雙輸出降壓轉換器，其採用TSMC 0.35μm 2P4M CMOS製程實現，晶片面積為1.96 x 1.79 mm2(含PADs)。使用磁滯電流控制方式能使輸出有快速的暫態響應；且利用適應性分時多工控制方式可減少交叉調節對兩個輸出造成的影響，實驗結果顯示當負載電流變化100mA時暫態響應小於5μs。當負載電流為300mA時有最大效率82.7%。此單一電感雙輸出直流-直流降壓轉換器只使用一個電感去產生兩組獨立的輸出電壓。當輸入電源電壓為3.6V，此轉換器可提供兩組輸出電壓從0.9V到3V。

關鍵字

降壓轉換器 ； 直流-直流轉換器 ； 前饋 ； 單電感雙輸出

並列摘要

The first part of this thesis is to propose a buck converter with load regulation improvement. It is proposed and implemented with a TSMC 0.35μm 2P4M CMOS process, the chip area is about 1.572 x 1.589 mm2 (with PADs). The proposed structure with feed-forward design by sensing load current from power MOS transistors to improve light-load to heavy-load output voltage potential, it can improve load regulation and achieve high efficiency. The experimental results show the maximum efficiency is about 94% with the load current of 200mA. The load regulation is 6.22(ppm/mA) when the load current changes from 0mA to 400mA. The input power supply is 3.6V and the converter precisely provides an adjustable output with a voltage range from 1V to 3V.
The second part of this thesis introduces the design of fast-response single-inductor dual-output buck converter. It was fabricated and implemented with a TSMC 0.35μm 2P4M CMOS process, the chip area is roughly 1.96 x 1.79 mm2 (with PADs). Using hysteresis-current-controlled techniques to achieve fast transient response, the adaptive time-multiplexing technique is used to reduce cross regulation of the two output voltages. The experimental results show that the response time of the proposed converter with load variation from 10mA to 110mA is 5μs. The maximum efficiency is about 82.7% when load current is 300mA. This single-inductor dual-output dc-dc buck converter used only one inductor to provide two independent output voltages. With a 3.6V input power supply, this converter provides two output voltages from 0.9V to 3V.

並列關鍵字

buck converter ； dc-dc converter ； feed-forward ； single-inductor dual-output

參考文獻

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