Switching regulator with improved load regulation and the method thereof
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorLei Li
Life of this patent
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Abstract
A switching regulator with improved load regulation is discussed. The switching regulator increases an on time length of a first power switch if the switching regulator operates at discontinuous current mode and a current flowing through the second power switch crosses a zero reference, until the first power switch is turned on again; and the switching regulator maintains the on time length of the first power switch during other time period.
Claims16
A switching regulator, comprising:
- a power stage, having a first power switch and a second power switch configured to be periodically turned on and turned off, to convert an input voltage into an output voltage;
- an amplifier, configured to generate an intermediate signal in response to a reference voltage and a feedback voltage indicative of the output voltage;
- and
- a sample-held circuit, configured to sample and hold the intermediate signal, to generate a sample-held signal, wherein the sample-held circuit is configured to sample the intermediate signal and to hold a sampled result during an operation of the switching regulator, except when both a) the switching regulator operates at discontinuous current mode, and b) a current flowing through the second power switch crosses a zero reference;
- and wherein if both a) the switching regulator operates at discontinuous current mode, and b) the current flowing through the second power switch crosses the zero reference, the sample-held circuit is configured to stop a sampling and to hold a value of the intermediate signal right before the sampling is stopped, until the first power switch is turned on again.
A switching regulator, comprising:
- a power stage, having a first power switch and a second power switch configured to be periodically turned on and turned off, to convert an input voltage into an output voltage;
- and
- a controller, configured to control the first power switch and the second power switch, wherein an on time length of the first power switch is controlled to be maintained during an operation of the switching regulator, except when both a) the switching regulator operates at discontinuous current mode, and b) a current flowing through the second power switch crosses a zero reference;
- and wherein if both a) the switching regulator operates at discontinuous current mode, and b) the current flowing through the second power switch crosses the zero reference, the on time length of the first power switch is controlled to be increased, until the first power switch is turned on again.
A method used in a switching regulator, the switching regulator includes a first power switch and a second power switch, configured to be periodically turned on and off, to convert an input voltage into an output voltage, the method comprising:
- generating an intermediate signal in response to a reference voltage and a feedback voltage indicative of the output voltage;
- and
- keeping sampling the intermediate signal and holding a sampled result to generate the sample-held signal during an operation of the switching regulator, except when both a) the switching regulator operates at discontinuous current mode, and b) a current flowing through the second power switch crosses a zero reference;
- and wherein if both a) the switching regulator operates at discontinuous current mode, and b) the current flowing through the second power switch crosses the zero reference, stopping a sampling and holding the intermediate signal right before the sampling is stopped, until the first power switch is turned on again.
Dependencies are inferred from the claim text.