Method and apparatus for a control circuit responsive to an impedance coupled to a control circuit terminal
First Claim
1. A method, in a power supply controller, of responding to an increase in current through a terminal of the power supply controller, the method comprising:
- regulating the terminal to a first voltage level;
sensing a magnitude of a first current through the terminal while the controller is regulating the terminal to the first voltage level;
providing an initial response by the power supply controller in response to the magnitude of the first current exceeding a first threshold current level;
regulating the terminal to a second voltage level after the magnitude of the first current exceeds the first threshold current level;
sensing a magnitude of a second current through the terminal while the controller is regulating the terminal to the second voltage level; and
determining a final response of the power supply controller in response to the magnitude of the second current.
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Abstract
A method, in a power supply controller, of responding to an increase in current through a terminal of the power supply controller, is disclosed. The method includes regulating the terminal to a first voltage level and sensing a magnitude of a first current through the terminal while the controller is regulating the terminal to the first voltage level. The method also includes providing an initial response by the power supply controller in response to the magnitude of the first current exceeding a first threshold current level and then regulating the terminal to a second voltage level after the magnitude of the first current exceeds the first threshold current level. The magnitude of a second current through the terminal is sensed while the controller is regulating the terminal to the second voltage level and the controller determines a final response based on the magnitude of the second current.
117 Citations
10 Claims
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1. A method, in a power supply controller, of responding to an increase in current through a terminal of the power supply controller, the method comprising:
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regulating the terminal to a first voltage level; sensing a magnitude of a first current through the terminal while the controller is regulating the terminal to the first voltage level; providing an initial response by the power supply controller in response to the magnitude of the first current exceeding a first threshold current level; regulating the terminal to a second voltage level after the magnitude of the first current exceeds the first threshold current level; sensing a magnitude of a second current through the terminal while the controller is regulating the terminal to the second voltage level; and determining a final response of the power supply controller in response to the magnitude of the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification