Patent ID: 9306451
Filing Date: 2016-04-05
CPC Classification: H02M

Claim Text:
1. A control circuit for controlling a switch mode power supply, the switch mode power supply having an output terminal configured to provide an output voltage which is configured to regulate to an output target, the switch mode power supply comprises a first switch having a control terminal, wherein the control circuit comprising: a switching control unit, having an output terminal, wherein the output terminal is configured to provide a pulse signal based on the output voltage and the output target; an overshoot control unit, having an output terminal, wherein the output terminal is configured to provide an overshoot control signal based on the output voltage and a first threshold voltage; and a first logic unit, having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is coupled to the output terminal of the switching control unit to receive the pulse signal, the second input terminal is coupled to the output terminal of the overshoot control unit to receive the overshoot control signal, and the output terminal is configured to provide a switching control signal to the control terminal of the first switch based on the pulse signal and the overshoot control signal; and wherein the first switch is turned OFF when the overshoot control signal is in a first state, and the first switch is controlled based on the pulse signal when the overshoot control signal is in a second state; wherein when the output voltage increases to the first threshold voltage, the control circuit is configured to turn OFF the first switch, and wherein the first threshold voltage is less than the output target.