| Summary: | 碩士 === 大同大學 === 電機工程學系(所) === 104 === A DC-DC bulk converter has been designed and simulated with TSMC 0.35 CMOS models. To improve the conversion efficiency, the converter is designed to switch between two modes, PWM mode for heavy load and PFM mode for light load.
This converter with on-chip current sensor can operate from 300 kHz to 600kHz with supply voltage from 3 to 5 V suitable for battery supply applications. With a 3.7V supply, switching frequency 262.47kHz, a 10-µF off-chip capacitor and a10-µH off-chip inductor, the HSPICE simulation results show that the output ripple voltage is about 20 mV and the maximum power efficiency is 84% at load current of 400mA in PWM mode. The output ripple voltage is about 600 mV and the maximum power efficiency is 75% at load current of 80 mA in PFM mode.
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