CURRENT SENSE CIRCUIT STABILIZED OVER WIDE RANGE OF LOAD CURRENT

摘要

A circuit includes a power transistor (M301) including a first control input and first and second current terminals, the second current terminal to be coupled to a load (345) to provide current to the load (345). A second transistor (M302) includes a second control input and third and fourth current terminals, and the first and second control inputs connected together, and the first and third current terminals connected together. A third transistor (M303) includes a third control input and fifth and sixth current terminals. A fourth transistor (M304) includes a fourth control input and seventh and eighth current terminals, and the seventh current terminal is coupled to the fourth and fifth current terminals. An amplifier (351) amplifies a difference between voltages on the second and fourth current terminals. An output of the amplifier (351) is coupled to the third control input, and a diode device (M358) is connected between the third and fourth control inputs.