Patent ID: 7248029

Claim:
A circuit, comprising: switching means for coupling and decoupling first and second terminals of a power supply, one of the first and second terminals to be coupled to an input of the power supply, the other of the first and second terminals to be coupled to an energy transfer element of the power supply; controlling means coupled to the switching means for controlling the switching means, the controlling means coupled to the switching means and to a third terminal of the power supply, the third terminal to receive a feedback signal representative of an output level of the power supply, the feedback signal having a first feedback state that represents an output level that is above a threshold level and a second feedback state that represents an output level that is below the threshold level; and oscillating means for providing an oscillating signal, the oscillating signal to oscillate at a first frequency under a first set of conditions and at a second frequency under a second set of conditions, the controlling means for controlling the switching means in response to the feedback signal and the oscillating signal.