在發光二極體混光應用中，需要個別控制紅光、綠光、藍光發光二極體的電流以達到調光控制，因此多組輸出的發光二極體驅動器需能獨立控制發光二極體電流。本論文設計與研製一單電感多輸出可調光發光二極體降壓型驅動電路，降壓型轉換器採用一次側控制法，並可操作於準諧振模式、限頻模式及降頻模式以提升電路效率。利用一次側DSP控制器傳遞一變頻訊號來控制輸出端的調光順序及導通時間。最後，本文實際研製一降壓型三輸出之發光二極體驅動電路，三組發光二極體之輸出分別為紅光(25 V/0.2 A)、綠光(40 V/0.2 A)與藍光(40.5 V/0.2 A)，調光皆可獨立控制於5 % -100 %範圍，並可應用於市電輸入電壓90 - 264 Vrms，調光最大誤差為10%，效率最高可達94%。

Individual LED dimming control is required for RGB light mixing applications by controlling LED currents independently with multiple-output LED drivers. In this thesis, a single-inductor multiple-output dimmable LED driver with buck converter is designed and implemented. According to the overall output power and input voltage conditions, the buck converter with the primary-side control can be operated in QR mode, frequency limitation with the valley switching and frequency reduction mode to improve the system efficiency. The varied frequency controlled signal method is proposed to control the dimming sequence and the conducting times of the RGB LED strings. Finally, the buck-type SIMO LED driver with the universal input voltages 90 - 264 Vrms to drive Red (25 V/0.2 A), Green (40 V/0.2 A) and Blue (40.5 V/0.2 A) LED lamps is implemented. The dimming range is from 5 % to 100 % individually. The highest error of the dimming is 10% and the highest efficiency is 94%.

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