FREQUENCY MODULATING CONTROLLER, A SWITCH-MODE POWER SUPPLY INCLUDING THE SAME, AND A METHOD FOR MODULATING THE FREQUENCY OF A SWITCHING OPERATION, CAPABLE OF REDUCING OUTPUT VOLTAGE RIPPLE

摘要

PURPOSE: A frequency modulating controller, a switch-mode power supply including the same, and a method for modulating the frequency of a switching operation are provided to control a ripple controlling signal by compensating a differential voltage.;CONSTITUTION: A peak detector(125) detects and holds the highest value(HV) of a detection voltage(SV). A ripple generator(110) generates a current ripple(Ic) using a difference of the highest value and the detecting voltage. The current ripple is in proportion to the difference. The ripple generator includes a current transformer(12). A modulation control signal generator(121) generates a modulation control signal(Iosc). The modulation control signal is varied according to the current ripple.;COPYRIGHT KIPO 2011