| 摘要 |
A novel method to operate a switching regulator is presented. The method includes the generation of at least two reference signals. A first reference signal is a constant DC voltage signal and a second reference signal is a periodic ramp sawtooth signal at a given frequency. It also includes the generation of a feedback signal by using the output voltage of the switching regulator. In one method, a capacitor is either charged by a bias current or discharged by a switch. A first comparator is configured to compare a first constant DC reference voltage signal to a feedback signal. A second comparator is configured to compare a periodic negative ramp sawtooth signal to a voltage signal on the capacitor. In an alternative method, a comparator is configured to compare the feedback signal to either the periodic ramp sawtooth reference signal or the constant DC reference signal depending on the switching operation of the switching regulator. In the alternative method, the periodic ramp sawtooth reference signal can be either positive or negative. The method is presented for buck switching regulators, and can be utilized also for boost, buck-boost, flyback, forward, and sepic, etc. |
