Quick-response generating circuit for voltage regulator, method and application thereof

The invention relates to a quick-response generating circuit for a voltage regulator. The voltage regulator is used for generating regulated output voltage on a power output end and comprises a first quick-response comparator, a second quick-response comparator, a quick-response signal generating circuit and a switch, wherein the switch is connected between a power input end and the power output end and switched by a pulse-width modulation signal. The quick-response generating circuit for the voltage regulator is characterized in that the first quick-response comparator compares first reference voltage and a feedback signal derived from the output voltage to generate a set signal; the second quick-response comparator compares the feedback signal and second reference voltage to generate a reset signal; the quick-response signal generating circuit generates a quick-response signal according to the set signal and the reset signal so as to determine a quick-response pulse used for being inserted into the pulse-wi