DIGITAL PULSE FREQUENCY/PULSE AMPLITUDE (DPFM/DPAM) CONTROLLER FOR LOW-POWER SWITCHING-POWER SUPPLIES

摘要

A digital controller for dc-dc switching converters can operate under light load conditions. The controller can be suitable for the use in switch-mode power supplies providing regulated output voltage for handheld devices and other low-power electronics. To create long time intervals, compared to the propagation time of digital logic a DPFM/DPAM can use a ring oscillator with two sets of delay cells and two signals racing around the ring.