Patent ID: 9069364
Filing Date: 2015-06-30
Classification: G05F,H02M,Y02B

Abstract:
1. An on-time generator configured to provide a timing signal to terminate an on-time interval of a voltage converter, wherein the on-time interval is associated with a low-impedance mode of a transistor of the voltage converter, the on-time generator comprising: a timing capacitor configured to provide a timing voltage; a comparator configured to compare the timing voltage to a threshold voltage and to provide the timing signal using a comparison of the timing voltage and the threshold voltage, the comparator configured to be disabled outside of the on-time interval and having a start-up delay prior to comparing the timing voltage and the threshold voltage; a current source configured to discharge the timing voltage of the timing capacitor after the start-up delay; first and second compensation capacitors configured to bias the timing voltage of the timing capacitor to compensate for the start-up delay, wherein the size of the first compensation capacitor is different than the size of the second compensation capacitor; a first switch configured to couple a second node of the first compensation capacitor with an input voltage of the voltage converter during the start-up delay; and wherein a first node of the first compensation capacitor, a first node of the second compensation capacitor, and a first node of the timing capacitor are coupled together with a first input of the comparator.