Abstract

The paper presents the design of a fast voltage-mode hysteretic buck converter with adaptive ripple controller. The conventional hysteretic converters have the merit of fast response and yet stable operation. However, the output voltage ripple is always higher than the fixed window of the hysteretic comparator. The adaptive ripple controller is a circuit which automatically generates a virtual hysteresis window for the hysteretic comparator such that the output voltage ripples are stable within the fixed hysteresis window according to the load conditions. The hysteretic comparator with the adaptive ripple controller has been designed and implemented with the TSMC .35 CMOS process.

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