Patent ID: 9647552
Date: 2017-05-09
CPC Classifications: H02M

Claim:
1. A reference compensating circuit used in a COT control circuit, wherein the reference compensating circuit is configured to generate a calibrated compensation reference signal at a compensation node, and wherein based on the calibrated compensation reference signal, the COT control circuit is configured to control a switching converter to convert an input voltage into an output voltage through turning a main switch and a freewheeling component on and off alternately, the reference compensating circuit comprising: an error amplifier configured to receive a reference signal and a feedback signal representative of the output voltage, and to generate an error signal based on the feedback signal and the reference signal; a first current sink coupled to the compensation node, wherein the first current sink is configured to receive the error signal and to generate a first current based on the error signal, and wherein the first current flows out from the compensation node; a resistor having a first terminal coupled to the reference signal, and a second terminal coupled to the compensation node; a second current sink coupled to the compensation node to sink a second current from the compensation node when the main switch is turned on; a first current source coupled to the compensation node to source a third current into the compensation node; and a compensation capacitor coupled between the compensation node and a ground.