Method and apparatus for a control circuit with multiple operating modes
First Claim
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1. A controller for use in a power converter, the controller comprising:
- an oscillator to be coupled to a switch of the power converter to determine a switching cycle period of the switch; and
a logic circuit to be coupled to the switch to control a duty cycle of the switch in response to a magnitude of a feedback signal to regulate an output of the power converter such that a control loop gain of the power converter is substantially constant during a transition of the controller between duty cycle control modes, wherein the logic circuit keeps a substantially constant control loop gain by maintaining a substantially constant rate of change of the duty cycle with respect to changes in the magnitude of the feedback signal as the controller transitions between the duty cycle control modes.
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Abstract
An example controller for use in a power converter includes an oscillator and a logic circuit. The oscillator is to be coupled to a switch of the power converter and determines a switching cycle period of the switch. The logic circuit is also to be coupled to the switch to control a duty cycle of the switch in response to a magnitude of a feedback signal to regulate an output of the power converter. The logic circuit controls the duty cycle of the switch such that a control loop gain of the power converter is substantially constant during a transition of the controller between duty cycle control modes.
109 Citations
11 Claims
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1. A controller for use in a power converter, the controller comprising:
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an oscillator to be coupled to a switch of the power converter to determine a switching cycle period of the switch; and a logic circuit to be coupled to the switch to control a duty cycle of the switch in response to a magnitude of a feedback signal to regulate an output of the power converter such that a control loop gain of the power converter is substantially constant during a transition of the controller between duty cycle control modes, wherein the logic circuit keeps a substantially constant control loop gain by maintaining a substantially constant rate of change of the duty cycle with respect to changes in the magnitude of the feedback signal as the controller transitions between the duty cycle control modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification