Patent ID: 7902805
Filing Date: 2011-03-08
Classification: H02M

Abstract:
1. A self-oscillating DC-DC buck converter with zero hysteresis, comprising: a comparator with a supply input, a non-inverting input to which a reference voltage is applied, an inverting input to which a feedback signal is applied, and an output , wherein an oscillating frequency is determined by a propagation delay of the converter; and the propagation delay of the converter is controlled by adjusting a bias of the comparator; a filter network connected to the output of the comparator; and a frequency control loop with a reference clock input, a signal input connected to the output of the comparator, and an output connected to a bias input of the converter, wherein the feedback signal is derived from the filter network, the converter output voltage is determined by the reference voltage and the comparator self-oscillates without requiring any hysteresis.