Ripple generation device and method for a constant on-time voltage regulator
AssigneeNXP USA, Inc.
InventorBin Shao
Life of this patent
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Abstract
Embodiments of ripple generation devices for a constant on-time voltage regulator and methods for ripple generation for a constant on-time voltage regulator are described. In one embodiment, a ripple generation device for a constant on-time voltage regulator includes a ripple generator configured to generate a ripple signal, a detector operably connected to the ripple generator and configured to detect a difference between an amplitude of the ripple signal and at least one reference amplitude and a feedback controller operably connected to the ripple generator and the detector and configured to generate a control signal for controlling the amplitude of the ripple signal based on the detected difference. Other embodiments are also described.
Claims20
A ripple generation device for a constant on-time voltage regulator, the ripple generation device comprising:
- a ripple generator configured to generate a ripple signal;
- a detector operably connected to the ripple generator and configured to detect a difference between an amplitude of the ripple signal and a first reference amplitude and a second reference amplitude;
- and
- a feedback controller operably connected to the ripple generator and the detector and configured to generate a control signal for controlling the amplitude of the ripple signal based on the detected difference;
- wherein the control signal decreases the amplitude of the ripple signal if above the first reference amplitude and increases the amplitude of the ripple signal if below the second reference amplitude.
A constant on-time voltage regulator, the constant on-time voltage regulator comprises:
- a power stage configured to convert an input direct current (DC) voltage into an output DC voltage;
- a driver device configured to drive the power stage;
- a timer configured to generate a constant on-time for the drive device;
- a ripple generation device configured to generate a ripple signal, wherein the ripple generation device comprising:
- a ripple generator configured to generate the ripple signal;
- a detector operably connected to the ripple generator and configured to detect a difference between an amplitude of the ripple signal and at least one reference amplitude;
- and
- a feedback controller operably connected to the ripple generator and the detector and configured to generate a control signal for controlling the amplitude of the ripple signal based on the detected difference;
- and
- a comparator configured to perform voltage comparison in response to the ripple signal to generate an output to the timer.
A method for ripple generation for a constant on-time voltage regulator, the method comprising:
- generating a ripple signal;
- detecting a difference between an amplitude of the ripple signal and a first reference amplitude and a second reference amplitude;
- and
- generating a control signal for controlling the amplitude of the ripple signal based on the detected difference;
- wherein the control signal decreases the amplitude of the ripple signal if above the first reference amplitude and increases the amplitude of the ripple signal if below the second reference amplitude.
Dependencies are inferred from the claim text.