Apparatus and method for switching regulator with compensation delay for output voltage error correction
First Claim
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1. A circuit for regulation, comprising:
- a regulator controller that is operable to control conversion of an input voltage to a regulated output voltage, wherein the regulator controller includes;
a comparator that is operable to provide a comparator output signal that is based, in part, on at least one of an inductor current or the regulated output voltage; and
a delay compensation circuit that is operable to provide a driver input signal from the comparator output signal by adding a compensation delay to the comparator output signal such that the compensation delay is sufficient to approximately correct an error in the regulated output voltage, wherein the regulated output voltage is based, in part, on the driver input signal.
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Abstract
A hysteretic regulator is provided. The hysteretic regulator includes a delay compensation circuit that adds a delay to the output of the hysteretic comparator. The delay is dependent on the input voltage. For low duty cycles, the slope of the inductor current is much greater for the rising edge than it is for the falling edge. The delay compensation circuit adds sufficient delay to the falling edge so that the undershoot cancels the overshoot.
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Citations
21 Claims
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1. A circuit for regulation, comprising:
a regulator controller that is operable to control conversion of an input voltage to a regulated output voltage, wherein the regulator controller includes; a comparator that is operable to provide a comparator output signal that is based, in part, on at least one of an inductor current or the regulated output voltage; and a delay compensation circuit that is operable to provide a driver input signal from the comparator output signal by adding a compensation delay to the comparator output signal such that the compensation delay is sufficient to approximately correct an error in the regulated output voltage, wherein the regulated output voltage is based, in part, on the driver input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 21)
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13. A circuit for regulation, comprising:
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a hysteretic power regulator controller that is operable to control hysteretic conversion of an input voltage to a regulated output voltage, wherein the hysteretic power regulator controller includes; a hysteretic comparator that is operable to provide a hysteretic comparator output signal that is based, in part, on at least one of an inductor current or the regulated output voltage; and a delay compensation circuit that is operable to provide a driver input signal from the hysteretic comparator output signal by adding an input-voltage-dependent delay to the hysteretic comparator output signal such that the input-voltage-dependent delay is sufficient to approximately correct overshoot error in the regulated output voltage, wherein the regulated output voltage is based, in part, on the driver input signal. - View Dependent Claims (14)
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15. A method for error correction, comprising:
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converting an input signal into a regulated output signal, wherein converting the input signal into the regulated output signal includes; performing a comparison to provide a comparison output signal, wherein the comparison is based, in part, on at least one of an inductor current and the regulated output signal; providing a delay compensation output signal by adding a compensation delay to the comparator output signal such that the compensation delay is sufficient to approximately correct an error in the regulated output voltage; and driving a switch based, at least in part, on the delay compensation output signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification