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A gate driver IC with programmable driving strength to reduce conducted electromagnetic interference (CEMI) in SMPS is presented in this paper. The solution presented is to dynamically adjust the gate driving strength (output resistance Rout) at the arrival of each gate pulse to minimize CEMI while maintaining low switching loss. Dynamically adjusting Rout is not possible with conventional gate driver...
This paper presents an integrated 6V to 1V, 3W DC-DC converter with a novel one-step dead-time digital controller designed for 40V 0.25μm CMOS technology. The proposed one-step digital control scheme can continuously optimize the dead-times for the turn-on and turn-off of the power MOSFETs. Comparing with previously reported dead-time optimization techniques, this work can achieve quick and accurate...
A fully integrated DC-DC converter with digitally controlled dual output stages is introduced in this paper. An auxiliary output stage is added in parallel to the main output switching stage to mitigate the trade-off between fast load transient response and high power conversion efficiency. A 12V-to-1V, 3W voltage-control-mode prototype converter is designed and fabricated with TSMC 0.25μm 40V process...
In this paper, the transistor sizing of an auxiliary output stage in a digitally controlled transient suppression system for fully integrated point-of-load (POL) DC-DC converters is investigated. The auxiliary output stage is added in parallel to the main output switching stage to help reduce output voltage deviation during load transient. The sizing of the auxiliary output stage in relation to the...
Fast load transient response and high power conversion efficiency in DC-DC converters have conflicting requirements on the size of the inductor. In this paper, an integrated point-of-load (POL) DC-DC converter with an smaller auxiliary output stage added in parallel to the main output switching stage to help reduce the output voltage deviation during load transient is investigated. The transistor...
This work presents a novel energy conservation technique based on predicting the load current of a DC-DC converter that may feed a variety of loads, such as speakers and displays. The predicted load cnrrent is used to dynamically adjust the size of the output stage transistors and to switch into PFM mode to maximize the instantaneous converter efficiency. By using a segmented output stage, the trade-off...
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