Overcoming leakage current by output precharging in error amplifiers

Abstract

Initial control loop conditions are essential in switching circuits where fault detection blocks are present, in order to avoid permanent fault triggers. Furthermore, multi-channel switching interference may affect circuit functionality and cause additional fault triggers. Error amplifiers aquire the difference between sensed and reference signals and output a correction voltage. We propose a solution which ensures that the initial correction voltage does not determine a perpetual fault condition. The proposed solution is implemented in a current mode buck control loop, which delivers constant current through a load.