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Buck converters for wide operation range are frequently seen in various applications. In many cases it is preferable to use one fixed compensator to fit the wide operation range. In this paper, an adaptive ramp control scheme is applied to peak current mode (PCM) controlled Buck converters for wide operation range. The control bandwidth of the PCM buck converter is improved by adaptively adjusting...
This paper focuses on a sample-data model for double edge current programmed mode control (DECPM) and its application to high-frequency and wide-range dc-dc converters. Steady-state conditions and subharmonic oscillation issues for DECPM are addressed. By combining the conventional peak and valley current programmed mode control, a sample-data model for DECPM is proposed. A small signal model for...
This paper presents a transistor level design of a current mode 4 switch buck boost converter (4SBBC) for polar modulation. The reference signal of this 4SBBC is the envelope signal of EDGE (Enhancement Data-rate for GSM Evolution) standard which has more than 200 kHz bandwidth. In order for output voltage to follow this fast varying reference signal, this 4SBBC uses current mode control with 10 MHz...
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