Method and apparatus for a control circuit responsive to an impedance coupled to a control circuit terminal
First Claim
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1. A power supply, comprising:
- a controller including a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation; and
a detection circuit external to the controller and coupled to the sense terminal, the detection circuit including a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition,wherein during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current.
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Abstract
An example power supply includes a controller and a detection circuit. The controller includes a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation. The detection circuit is external to the controller and is coupled to the sense terminal. The detection circuit includes a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition, where during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current.
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Citations
14 Claims
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1. A power supply, comprising:
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a controller including a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation; and a detection circuit external to the controller and coupled to the sense terminal, the detection circuit including a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition, wherein during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification