Patent ID: 8350546

Claim:
A SEPIC converter with over-voltage protection that comprises: a high-side inductor connected between a node V w and a node V x ; a power MOSFET connected in series between the node V x and ground; a first capacitor connected between the node V x and a node V y ; a low-side inductor connected between the node Vy and ground; a rectifier diode connected between the node V y and a node V out ; an output capacitor connected between the node V out and ground; a PWM control circuit connected to drive the gate of the power MOSFET; an over-voltage protection MOSFET connected to control the flow of current from an input supply to the node V w and the PWM control circuit; and a comparator connected to drive the gate of the over-voltage protection MOSFET so that the node V w and the PWM control circuit are disconnected from the input supply when the voltage of the input supply exceeds a predetermined value V ref .