在本論文中完成一個同步電流型脈衝寬度調變切換式降壓穩壓器的設計與實作。此穩壓器有適中的輸出鏈波電壓與高的轉換效率，因此適合應用在以電池供電的可攜式電子系統，如:手機、MP3播放器、PDA..等。此包含積體功率開關的穩壓器由電流模式控制而非電壓模式，此乃因電流模式控制相較於電壓模式控制有較好的線調節率、容易補償、較快的暫態反應..等好處。對電流模式控制而言，電感電流是一相當重要的資訊，因電感電流訊號需與補償斜波結合來避免次諧波震盪現象，此為電流模式控制獨有的現象。相較於一般用電阻來偵測電感電流，本論文使用一電感電流偵測電路來減少功率消耗;此外，使用一零電流交叉偵測電路來消除逆向電感電流。

此電流型切換式降壓穩壓器是使用台灣積體電路製造股份有限公司所提供的0.35um 2P4M 3.3V/5V 混合訊號互補式金氧半製程來製造。晶片的全部面積大約1.2×1.1mm2。晶片實作的量測結果顯示系統穩定無次諧波震盪;當輸入電壓由4.0V變化至5.4V時，線調節率為0.6%;輸出電流由10mA變化至250mA時，負載調節率為4.1%且最大效率為94%。

The design and implementation of a current mode PWM buck switching regulator for portable application is presented in this thesis. This regulator has moderate output voltage ripple in steady state and high power conversion efficiency. Hence, this regulator is suitable for portable electronic applications that are powered by batteries such as cellular phone, MP3 player, PDA, etc.
The switching regulator with integrated power switches is designed with the current mode control rather than voltage mode control. Compared with the voltage mode control, the current mode control has some advantages such as easy compensation, better line regulation, fast transient response, etc. The inductor current is particularly important for current mode PWM control, as the sensed inductor current is mandatory to combine with the compensating ramp in order to avoid sub-harmonic oscillation in current mode PWM converter. A current sensing circuit instead of the sensing resistor is used to sense the inductor current for reducing power dissipation. To eliminate the reverse inductor current at DCM, the zero cross detector is designed.
This current mode buck switching regulator is fabricated with TSMC 0.35μm 2P4M 3.3V/5V Mixed Signal CMOS process. The total chip area is about 1.2×1.1 mm2. Experimental results shows the line regulation=0.6% when Vin=4.0V~5.4V, load regulation=4.1% and maximum efficiency=94% when ILoad=10mA~250mA.

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