INPUT OVERVOLTAGE PROTECTION USING CURRENT LIMIT

摘要

A controller for use in a power converter includes a state selection circuit coupled to receive an input voltage sense signal representative of an input voltage, a switch current sense signal representative of a switch current of a power switch, and a feedback signal representative of an output quantity of the power converter. The state selection circuit is coupled to generate an input voltage signal in response to the input voltage sense signal, an input current signal in response to the switch current sense signal, and an input threshold signal in response to the feedback signal. A state machine circuit is coupled to the state selection circuit to generate a drive signal in response to the input voltage signal, the input current signal, and the input threshold signal to switch the power switch to control a transfer of energy from an input to an output of the power converter.

主权项

1. A controller for use in a power converter, comprising:
a state selection circuit coupled to receive an input voltage sense signal, a switch current sense signal, and a feedback signal, wherein the input voltage sense signal is representative of an input voltage of the power converter, wherein the switch current sense signal is representative of a switch current of a power switch of the power converter, wherein the feedback signal is representative of an output quantity of the power converter, wherein the state selection circuit is coupled to generate an input voltage signal in response to the input voltage sense signal, wherein the state selection circuit is coupled to generate an input current signal in response to the switch current sense signal, and wherein the state selection circuit is coupled to generate an input threshold signal in response to the feedback signal; and a state machine circuit coupled to the state selection circuit to receive the input voltage signal, the input current signal, and the input threshold signal, wherein the state machine circuit is coupled to generate a drive signal in response to the input voltage signal, the input current signal, and the input threshold signal to control switching of the power switch to control a transfer of energy from an input of the power converter to an output of the power converter.