Abstract
This paper proposes a novel dynamic ramp valley control in a current-mode adaptive on-time controller for the on-chip buck converter. It improves the system stability and reduces the output voltage under the load-dump. The proposed novel dynamic ramp valley control uses a sample and hold circuit, a comparator, and a ramp valley control to avoid the generation of an erroneous pulse signal while regulating the output voltage under the load-dump. Finally, a buck converter with 12 to 19 V input voltage range and 1.05 V output voltage with the novel dynamic ramp valley control is implemented in an integrated circuit. Based on the hardware experimental results, the output voltage under the load-dump with and without the proposed dynamic ramp valley control is 156 and 224 mV, respectively. Thus, the output voltage with the proposed dynamic ramp valley control is lower by 68 mV than that without the proposed dynamic ramp valley control, avoiding the potential damage of the output load, moreover, this performance has been verified with the SIMPLIS simulation and hardware experimental results.
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