Power converter with power switch operable in controlled current mode
First Claim
1. A controller for a circuit having first and second switches configured to alternately enable conduction of said first and second switches with a duty cycle in response to an output characteristic of said circuit and control a light level of current in said first switch when said alternately enable conduction of said first and second switches is disabled.
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Accused Products
Abstract
A power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to alternately enable conduction of the first and the second power switches with a duty cycle in response to an output characteristic of the power converter. The controller is configured to control a level of current in the first power switch when the second power switch is substantially disabled to conduct.
132 Citations
20 Claims
- 1. A controller for a circuit having first and second switches configured to alternately enable conduction of said first and second switches with a duty cycle in response to an output characteristic of said circuit and control a light level of current in said first switch when said alternately enable conduction of said first and second switches is disabled.
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8. A method, comprising:
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alternately enabling conduction of first and second switches with a duty cycle in response to an output characteristic of a circuit; and controlling a light level of current in said first switch when said alternately enable conduction of said first and second switches is disabled. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A circuit, comprising:
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first and second switches; and a controller configured to alternately enable conduction of said first and second switches with a duty cycle in response to an output characteristic of said circuit and control a light level of current in said first switch when said alternately enable conduction of said first and second switches is disabled. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification