FAST HIGH-SIDE POWER FET GATE SENSE CIRCUIT FOR HIGH VOLTAGE APPLICATIONS

摘要

A circuit for sensing gate voltage of a power FET. A switching circuit includes a switching FET having a high voltage rating, its drain coupled to the gate of the power FET, and its source coupled to an output node. A first feedback loop is coupled to the gate of the switching FET to facilitate sensing rising gate voltage. A second feedback loop is coupled to the gate of the switching FET to facilitate sensing falling gate voltage.

主权项

1. A circuit for sensing voltage at a gate of a power FET, comprising:
an input node coupled to the gate of the power FET; an output node; and a switching circuit coupled between the input node and the output node, the switching circuit configured to generate a gate sense signal at the output node, the switching circuit including:
a first feedback loop to facilitate a rising gate voltage transition,a second feedback loop to facilitate a falling gate voltage transition, anda first switching FET having a high-voltage rating, and having a drain coupled to the input node; a source coupled to the output node; and a gate coupled to the first and second feedback loops.