CURRENT BALANCE CIRCUIT INCLUDING VARIABLE CONTROL CIRCUIT OF DUTY RATIO AND DC-DC CONVERTER HAVING IT

摘要

A current balance circuit for variably controlling a duty ratio comprises a current balancing unit balancing a current of a direct current-direct current (DC-DC) converter; a resistor-capacitor (RC) filter circuit connected to an output terminal of the current balancing unit; a comparator having a positive (+) input terminal to which a predetermined reference voltage is applied; and a duty ratio varying control circuit connected to the RC filter circuit and applying a comparison voltage formed according to a target duty ratio through ON/OFF switching to a negative (-) input terminal of the comparator.