| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus that realizes a control circuit to reduce energy consumption in a power converter under light or no load conditions by use of an unregulated dormant mode of operation.SOLUTION: A control circuit includes a drive signal generator coupled to generate a drive signal to control switching of a power switch to be coupled to the control circuit and to regulate an energy flow to a power converter output in response to an energy requirement of one or more loads to be coupled to the power converter output. An unregulated dormant mode control circuit is coupled to render dormant the drive signal generator when the energy requirement of the one or more loads falls below a threshold for more than a first period of time, thereby ceasing the regulation of the energy flow to the power converter output by the drive signal generator. The drive signal generator is coupled to be unresponsive to changes in the energy requirement of the one or more loads when dormant. The unregulated dormant mode control circuit is coupled to power up the drive signal generator after a second period of time has elapsed. |
