| 摘要 |
A switching power supply which uses carrier control and input voltage sensing. In one aspect, an output voltage is monitored to form a carrier signal. The carrier signal is compared to a signal that is representative of the input current in order to control the switching duty cycle. In addition, a signal representative of the input voltage is summed with the signal that is representative of the input current, or with the carrier signal, in order to effectively control the switching duty cycle under light load conditions and conditions in which the input voltage can vary.
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