When peak drain current is lowered to kPS(LOWER)*ILIMIT(set), the modulator transitions to multi-cycle-modulation mode. In this mode, at each turn-on, the modulator enables output switching for a period of TMCM(MIN) at the switching frequency of fMCM(MIN) (4 or 5 consecutive pulses at 30 kHz) with the peak drain current of kPS(LOWER)*ILIMIT(set), and stays off until the CONTROL pin current falls below IC(OFF). This mode of operation not only keeps peak drain current low, but also minimizes harmonic frequencies between 6 kHz and 30 kHz. By avoiding transformer resonant frequency, all potential transformer audible noises are greatly suppressed. This is all done while maintaining low output ripple.