| 摘要 |
The present invention relates to a power converter comprising a switched power stage configured to generate an output voltage from an input voltage and a controller configured to generate a pulsed control signal for switching the switched power stage in dependence of a voltage error signal. The voltage error signal is a difference between a reference voltage and an output voltage. The controller comprises a digital pulse width modulation control path and a digital constant on-time control path and wherein the controller is configured to toggle between a light load mode in which the digital constant-on-time is activated and a high load mode in which the digital PWM control path is activated. In contrast to the prior art where the constant on-time control path, specifically a continuous time comparator configured to compare the voltage error with a threshold to trigger a pulse of pre-set constant on-time, is a separate analog circuit consuming extra space and power, according to the present invention the constant-on time control path is designed digitally. |
