CONTROL CIRCUIT OF A CURRENT DRIVING METHOD SWITCH MODE DC-DC CONVERTER CAPABLE OF PREVENTING SUB HARMONIC OSCILLATION

摘要

PURPOSE: The control circuit of a current driving method switch mode dc-dc converter is provided to improve the property of a line transient response by actively controlling an artificial lamp signal over an input voltage.;CONSTITUTION: A current detection part(930) includes the structure of a common gate amplifier which detects the inductor current of a boost converter. A lamp signal generating unit(920) generates a predetermined current in a current waveform which is detected with the current detection part. The lamp signal generating unit recompenses sub harmonic oscillation by increasing a lamp signal which is generated. A current compensation part(940) duplicates the current flowing into the drain end of the common gate amplifier. The current compensation part lets the current re-flown to the drain end of the common gate amplifier.;COPYRIGHT KIPO 2012