ELECTRONIC CIRCUIT FOR ESTIMATING INTENSITY OF LOAD CURRENT BASED ON INTERNAL CONDITION OF BOOST CONVERTER

摘要

An electronic circuit includes an inductive element outputting an inductor current, a first transistor, a second transistor, and a load current estimator circuit. The first transistor is connected between a first end of the inductive element and a reference terminal. The second transistor is connected between the first end of the inductive element and an output terminal for outputting a load current. The load current estimator circuit receives a first voltage which is sensed between both ends of the second transistor in response to the inductor current while the first transistor is turned off and the second transistor is turned on, and outputs a second voltage based on a level of the first voltage at a reference time point within a time interval when the second transistor is turned on. The second voltage is associated with an intensity of the load current.