Patent ID: 9362830
Filing Date: 2016-06-07
CPC Classification: H02M

Claim Text:
1. A control Integrated Circuit (IC) for controlling a switch mode power supply, the switch mode power supply comprises a first switch having a control terminal, wherein the control IC comprising a reuse input pin, and when the first switch is turned ON, the control IC is configured to receive a current sense signal via the reuse input pin, and when the first switch is turned OFF, the control IC is configured to receive a voltage sense signal via the reuse input pin; wherein the control IC further comprising: a first protection unit, having a first input terminal, a second input terminal, and an output terminal, wherein the second input terminal is configured to receive a first threshold signal, and the output terminal is configured to provide a first protection signal based on the first threshold signal and a voltage at the first input terminal of the first protection unit; a second protection unit, having a first input terminal, a second input terminal, and an output terminal, wherein the second input terminal is configured to receive a second threshold signal, and the output terminal is configured to provide a second protection signal based on the second threshold signal and a voltage at the first input terminal of the second protection unit; a driving control unit, having a first input terminal, a second input terminal, a third input terminal and an output terminal, wherein the first input terminal is coupled to the output terminal of the first protection unit, the second input terminal is coupled to the output terminal of the second protection unit, the third input terminal is configured to receive a driving signal, and the output terminal is configured to provide a switching control signal to the control terminal of the first switch; and a single pole double throw switch, having a control terminal, a first terminal and a second terminal, wherein the control terminal is coupled to the output terminal of the driving control unit, the first terminal is coupled to the reuse input pin, and the second terminal is selectively coupled to the first protection unit and the second protection unit based on the switching control signal; wherein when the first switch is turned ON, the second terminal of the single pole double throw switch is coupled to the first input terminal of the first protection unit, and the first protection unit is configured to provide the first protection signal via comparing a voltage at the reuse input pin with the first threshold signal; and when the first switch is turned OFF, the second terminal of the single pole double throw switch is coupled to the first input terminal of the second protection unit, and the second protection unit is configured to provide the second protection signal via comparing the voltage at the reuse input pin with the second threshold signal.