FAST MODE TRANSITIONS IN A POWER CONVERTER

摘要

In described examples, a power conversion system includes a PFM controller (245), a PWM controller (255), and an auxiliary voltage output stage (270). The PFM controller (245) controls a power output stage (260) in a PFM mode in response to a power stage voltage output generated by the power output stage (260) during a first period of time in which the power output stage (260) is operating in the PFM mode. The PWM controller (255) controls the power output stage (260) in a PWM mode in response to a power stage voltage output generated by the power output stage (260) during a second period of time in which the power output stage (260) is operating in the PWM mode. The auxiliary voltage output stage (270) generates an auxiliary voltage during a third period of time, where the PWM controller (255) controls the auxiliary voltage output stage (270) using the auxiliary voltage during the third period of time.