Switching Regulator with Offset Correction
First Claim
Patent Images
1. A switching regulator for regulating an output voltage, comprising:
- an output circuit that receives an input voltage and produces the output voltage;
a comparator that causes the output circuit to turn on the output voltage when a feedback voltage falls below a first reference voltage;
an on-time timer that causes the output circuit to turn off the output voltage after a time-out period; and
an error amplifier that receives the feedback voltage and a second reference voltage and produces the first reference voltage.
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Abstract
A switching regulator generally includes an output circuit, a comparator, an on-time timer and an error amplifier. The output circuit receives an input voltage and produces an output voltage. The comparator causes the output circuit to turn on the output voltage when a feedback voltage falls below a first reference voltage. The on-time timer causes the output circuit to turn off the output voltage after a time-out period. The error amplifier receives the feedback voltage and a second reference voltage and produces the first reference voltage.
33 Citations
20 Claims
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1. A switching regulator for regulating an output voltage, comprising:
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an output circuit that receives an input voltage and produces the output voltage; a comparator that causes the output circuit to turn on the output voltage when a feedback voltage falls below a first reference voltage; an on-time timer that causes the output circuit to turn off the output voltage after a time-out period; and an error amplifier that receives the feedback voltage and a second reference voltage and produces the first reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of regulating a voltage comprising:
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generating an initial reference voltage with which an output voltage is to be regulated; generating, by an error amplifier, a corrected reference voltage having an offset correction based on a feedback voltage and the initial reference voltage; turning on a switching signal based on the corrected reference voltage and the feedback voltage; turning off the switching signal after an on-time period; generating the output voltage from an input voltage regulated by the switching signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A switching regulator for regulating an output voltage, comprising:
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a means for generating the output voltage; a means for producing a selected feedback voltage based on multiple feedback loops; a means for generating an offset-corrected reference voltage based on the selected feedback voltage and an initial reference voltage, with which the output voltage is regulated; a means for determining when the selected feedback voltage is below the offset-corrected reference voltage; a means for causing the output voltage generating means to increase the output voltage when the selected feedback voltage is below the offset-corrected reference voltage; a means for timing a minimum period of time; and a means for causing the output voltage generating means to decrease the output voltage when the timing means times out. - View Dependent Claims (17, 18, 19, 20)
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Specification