Power converter with adjustable ramp

A method comprising:

• monitoring a direct current (dc) voltage level of a dc blocking capacitor of a ramp generator of a power converter, wherein a ramp of the power converter is generated across a ramp capacitor of the ramp generator;
• providing a supply current flowing from an output of a first amplifier to the dc blocking capacitor and the ramp capacitor through a first auxiliary switch when the dc voltage level of the dc blocking capacitor is less than a first predetermined voltage threshold;
• and
• providing a sink current flowing from the ramp capacitor and the dc blocking capacitor to an output of a second amplifier through a second auxiliary switch when the dc voltage level of the dc blocking capacitor is greater than a second predetermined voltage threshold.

A converter comprising:

• a first switch and a second switch connected in series between an input power source and ground;
• an inductor connected between a common node of the first switch and the second switch, and an output capacitor;
• a control apparatus configured to generate gate drive signals for the first switch and the second switch, wherein the control apparatus comprises a feedback control apparatus and a ramp generator, wherein the ramp generator is configured to dynamically adjust an amplitude of a ramp to a different value based upon different operating conditions through providing either a supply current or a sink current to the ramp generator;
• an on-time control generator;
• and
• a latch having a set input configured to receive an output signal of the control apparatus and a reset input configured to receive an output signal of the on-time control generator.