Invention Grant
US09362822B2 Average load current detector for a multi-mode switching converter 有权
多模式开关转换器的平均负载电流检测器

Average load current detector for a multi-mode switching converter
Abstract:
An average load current detector for a multi-mode switching converter is disclosed. The average load current detector includes a sense voltage generator that generates an average sense voltage that is proportional to an average load current delivered by the multi-mode switching converter. Also included is a duty voltage generator that generates an average duty voltage that is proportional to a duty cycle of a pulse width modulation (PWM) signal that controls switching of the multi-mode switching converter. Further included is a comparator adapted to output a detector signal that indicates an operational mode for the multi-mode switching converter to operate in for predetermined load current ranges. A controller receives the detector signal and in response maintains an efficient energy transfer from one supply voltage level to another by transitioning the multi-mode switching converter from the PWM mode to a pulse frequency modulation (PFM) mode or vice versa if necessary.
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