Tung & Associates
Multi-phase switching regulator and control circuit and control method thereof
A multi-phase switching regulator includes: a plurality of power stages, a plurality of pulse width modulation (PWM) controllers and a ramp signal setting circuit. The PWM controllers generate corresponding PWM signals for controlling corresponding power stages respectively according to an error signal related to an output voltage and a plurality of ramp signals corresponding to corresponding power stages respectively. The ramp signal setting circuit adjusts the ramp signal of the phase that is to be enabled or disabled according to the phase adjustment signal. Under a phase-cut operation, the ramp signal setting circuit causes a basis level of the ramp signal corresponding to the phase to be disabled to gradually change, thereby decreasing a duty ratio of the PWM signal corresponding to the phase to be disabled.
RICHTEK TECHNOLOGY CORPORATION
H H
H02M H02M
inventional additional
Isaac Y. Jyun-Che Yu-Chang Yi-Wei Jo-Yu
Chen Ho Chen Lee Wang