DC-DC CONVERTER, CAPABLE OF EXTENDING SOFT START TIME WITHOUT INCREASING A CAPACITY VALUE USED IN A SOFT START CIRCUIT OF THE DC-DC CONVERTER

摘要

PURPOSE: A DC-DC converter is provided to remove overshoot of an output voltage without increasing a chip size, thereby preventing an inrush current.;CONSTITUTION: A DC-DC converter control circuit(119) comprises a PWM comparator circuit(102), a reference voltage circuit(103), an error amplifier(101), a triangular wave generating circuit(104), a NOR circuit(105), a soft start circuit(106), a buffer(107), an FB terminal(120), and an EXT terminal(121). The reference voltage circuit is connected to a non-inverting input terminal of the error amplifier. The non-inverting input terminal of the error amplifier is connected to the FB terminal. An inverting input terminal of the PWM comparator circuit is connected to the triangular wave generating circuit.;COPYRIGHT KIPO 2011