| Summary: | 碩士 === 國立臺灣大學 === 電子工程學研究所 === 103 === The thesis can be divided two parts. The first one presents a DC-DC converter uses the Hysteresis Prediction Voltage Control (HPVC) to suppress the transient overshoot voltage and speed the transient response. In steady state, this technique utilizes the two-stage error amplifier to compensate and raise the phase margin. When the transient occurs, it switches to the hysteresis mode to speed the transient response. This chip is implemented in a TSMC 0.35-μm 2P4M 3.3V/5V Mixed Signal CMOS process. According to measurement results, this chip operates at 1MHz, transient recovery time is 8μs. The maximum efficiency is 89.2% when load current is 200 mA. The area of this chip is about 2.85 mm2.The second part presents a LED driver with Twin Bus for dimmable lighting and SAR-controlled adaptive off-time technique. Twin Bus for dimmable lighting technique utilizes two voltage sources to reduce the voltage stresses on power transistors and obtain the high efficiency. The SAR-controlled adaptive off-time technique is used to calculate the accuracy inductor current, and the brightness of LEDs is constant. This chip is implemented in a TSMC 0.25-μm CMOS High Voltage 2.5/5/7/12/20/24/40/45/60V Mixed-Signal 1P5M process. According to simulation results, the efficiency of the LED driver is over 93 %, and the settling time is 3 μs.
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