FREQUENCY REGULATED HYSTERETIC AVERAGE CURRENT MODE CONVERTER

摘要

A switch mode power converter (76) that precisely controls average switching current and operating frequency. The switching control operative in hysteretic average current mode control provides wide bandwidth operation without the need for slope correction. The switching converter ripple current is varied by a frequency comparator (78) in response to a comparison of the switching frequency to a reference frequency. The ripple current is adjusted to obtain correlation between the operating switching frequency and the reference frequency. Peak current levels are precisely controlled and may be limited to prevent component stress levels from being exceeded. Current levels are continuously monitored with a current sense amplifier (14), or monitored with a high-gain low energy current sampler. Feedback loop independent line and load regulation is provided by continuous current monitoring, or by using variable slope charge and transfer voltage to pulse width converters when operating with a current sampler based system.