Constant on-time switching regulator implementing dual control loops

A control circuit for a switching regulator implements constant on-time control scheme with synchronous rectification and applies dual control loops to improve light load efficiency and enhance transient response. In one embodiment, the control circuit includes a first control loop configured to con...

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Bibliographische Detailangaben
Hauptverfasser:	ZHANG ZHIYE, CHANG KUANG MING
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	A control circuit for a switching regulator implements constant on-time control scheme with synchronous rectification and applies dual control loops to improve light load efficiency and enhance transient response. In one embodiment, the control circuit includes a first control loop configured to control a one-shot timer to generate a control signal to turn on the main switch when the feedback voltage is below a first reference voltage and a minimum off-time duration has expired. The control circuit further includes a second control loop configured to control the one-shot timer to generate the control signal to turn on the main switch when the feedback voltage is below a second reference voltage and the minimum off-time duration has expired and a low-side current signal has a first state indicative of a light load condition at the output node.