| 摘要 |
DC-DC voltage converter systems are provided in which a switching voltage converter is arranged with an inductor to switch first and second currents with duty cycles D and D′ determined by an error voltage Verr to thereby maintain an output voltage Vout. A transconductance amplifier having an amplifier output provides the error voltage Verr in response to the output voltage and a reference voltage Vref. A ripple current Irpl is provided to the amplifier output in response to the difference between the error voltage Verr and a clamp voltage Vclmp. Finally, a current comparator generates a skip signal to turn off the first and second currents in response to a selected threshold of the ripple current. In this process, the ripple current Irpl substantially clamps the error voltage Verr to the clamp voltage Vclmp. Preferably, the current comparator is arranged to provide the skip signal in response to the selected first threshold of the ripple current Irpl and retract the skip signal in response to a selected second threshold of the ripple current Irpl.
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