Out-of-phase signal producing arrangement for use in free running switching converter, has comparator providing out-of-phase signal, where voltage divided signal of voltage divider and ramp signal are applied to comparator

摘要

The arrangement has a sample-and-hold unit (140), where a ramp signal generated by a ramp signal generator (130) is applied to the unit. A voltage divider (150) provides a voltage divided signal proportional to a sample value, where the voltage divider is downstream to the sample-and-hold unit. A comparator (160) has the voltage divided signal and another ramp signal applied to it, and provides the out-of-phase signal.