Patent attributes
The invention relates to a method and an apparatus for maintaining a substantially constant switching frequency in a relatively fast transient response switching regulator. The apparatus includes a comparison circuit, a one-shot circuit, and a pulse duration controller. The comparison circuit provides a comparison signal to the one-shot circuit based on a comparison of a feedback signal and a reference signal. The one-shot circuit provides a configured duration switch control pulse when the comparison signal is asserted. The pulse duration controller controls the configured duration of the switch control pulse (e.g., duration of a pulse on-time or off-time) to affect the switching frequency of the regulator. In addition, frequency jittering and frequency scaling circuitry may be included.
