近年來發光二極體的各項應用起飛，包括液晶顯示器、LED照明、大面板顯示器背光源等，若能將電源端之控制晶片與LED驅動晶片整合，將能大幅縮減整體電路複雜度，也減少電路面積與成本。有鑑於此，本論文提出兩項架構，一為自動重置降壓調節之返馳式轉換控制器，二為矩陣式數位脈衝寬度調變LED驅動電路晶片。前者藉由返馳式轉換控制器讓交流市電轉為直流輸出，以產生LED串所需之順向電壓與驅動電路所需之供應電壓，後者則提出矩陣式數位脈衝寬度調變(Digital Pulse Width Modulation，DPWM)電路以降低閃爍以及電源抽載的變動幅度，再搭配可抗溫度變異之帶差參考電壓電路以定電流方式驅動LED，減少LED串的色彩偏移(color shift)現象，另外，此架構以高精度同重心佈局的方式來匹配主要的電流電晶體，使四通道之電流變異量降至最低，達到高度匹配之效果。
本論文之自動重置降壓調節之返馳式轉換控制器使用TSMC0.5μm 2P3M COMS 800V超高壓製程，晶片面積為2.043*3.057 mm2；而矩陣式數位脈衝寬度調變LED驅動電路晶片則使用TSMC0.25μm 1P3M COMS 60V高壓製程，晶片面積為1.76*1.37mm2。模擬與實測結果顯示，本論文所設計之晶片皆達預期規格。

In recent years, light-emitting diode (LED) has been widely applied to various circuits, such as liquid-crystal display, lighting, backlight source of large scanning boards display, etc. As LED application becomes more popular, it needs to be further adapted in order to better fit the market needs. For circuit simplification, chip area reduction and cost down, both the AC/DC controller and the LED driver will be designed. The supply voltages for LED strings and the corresponding driver are generated from the AC/DC converter with flyback control. Furthermore, the operation of Digital Pulse Width Modulation (DPWM) for LED dimming will be modified and enhanced to reduce flicker and lower the load current variation from the power supply. A temperature-compensated bandgap circuit is utilized to offer constant driving currents for LED strings to diminish color cast. Also, a high precision common centroid layout pattern is adopted to reduce the current mismatch among LED strings.
The flyback converter with auto reset dropout voltage is designed in a TSMC 0.5μm 2P3M COMS 800V ultra-high voltage process. The chip area is 2.0433.057 mm2. The LED driver with enhanced digital pulse width modulation is fabricated in a TSMC 0.25μm 1P3M COMS 60V high voltage process. The chip area is 1.76*1.37mm2. With simulation and measured results, both chips are turned out to function as expected.

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