A method includes starting a time count of a time interval at a start of a state change of a switch of a DC to DC converter; monitoring if the switch is in a skip mode; and disabling the skip mode in response to an expiration of the time interval so that the switch changes states at a frequency rate...http://www.google.fr/patents/US7098642?utm_source=gb-gplus-shareBrevet US7098642 - Controller for DC to DC converter