Switch-mode regulator including hysteretic control
First Claim
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1. A regulator circuit, comprising:
- a first switch configured to controllably connect a first voltage to an inductor;
a second switch configured to controllably connect a second voltage to the inductor;
a switch control circuit configured to control the first and second switches using a timer circuit;
wherein the switch control circuit is configured to turn off the first switch and to turn on the second switch for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage;
wherein the switch control circuit is configured to turn on the first switch and to turn off the second switch for a duration proportional to the third voltage divided by the first voltage;
wherein one of the first or third voltages corresponds to a desired output voltage;
wherein the second voltage is less than the first and third voltages; and
wherein the switch control circuit includes at least one of a peak threshold control circuit and a valley threshold control circuit and wherein the switch cycling period is adjustable using the at least one of the peak threshold control circuit and the valley threshold control circuit.
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Abstract
This document discusses, among other things, a regulator circuit. The regulator circuit can controllably connect a first voltage to an inductor using a first switch and can controllably connect a second voltage to the inductor using a second switch. The first switch can be turned off and the second switch can be turned on for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage. The first switch can be turned off and the second switch can be turned on for a duration proportional to the third voltage divided by the first voltage. One of the first or third voltages can correspond to a desired output voltage.
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Citations
20 Claims
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1. A regulator circuit, comprising:
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a first switch configured to controllably connect a first voltage to an inductor; a second switch configured to controllably connect a second voltage to the inductor; a switch control circuit configured to control the first and second switches using a timer circuit; wherein the switch control circuit is configured to turn off the first switch and to turn on the second switch for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage; wherein the switch control circuit is configured to turn on the first switch and to turn off the second switch for a duration proportional to the third voltage divided by the first voltage; wherein one of the first or third voltages corresponds to a desired output voltage; wherein the second voltage is less than the first and third voltages; and wherein the switch control circuit includes at least one of a peak threshold control circuit and a valley threshold control circuit and wherein the switch cycling period is adjustable using the at least one of the peak threshold control circuit and the valley threshold control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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controllably connecting a first voltage to an inductor using a first switch; controllably connecting a second voltage to the inductor using a second switch; turning off the first switch and turning on the second switch for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage; and turning on the first switch and turning off the second switch for a duration proportional to the third voltage divided by the first voltage, wherein one of the first or third voltages corresponds to a desired output voltage, and wherein the second voltage is less than the first and third voltages; and adjusting a switch cycling period using at least one of a peak threshold control circuit and a valley threshold control circuit. - View Dependent Claims (18, 19, 20)
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Specification