Patent ID: 8125002
Filing Date: 2012-02-28
Classification: H01L,H03K

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; an insulated gate transistor formed to the semiconductor substrate; a diode formed to the semiconductor substrate; a first control transistor formed to the semiconductor substrate; and a first sensing resistor formed to the semiconductor substrate, wherein a first current terminal of the insulated gate transistor is coupled to a cathode of the diode at a high potential side, wherein a second current terminal of the insulated gate transistor is coupled to an anode of the diode at a low potential side, wherein the first control transistor is configured to turn off the insulated gate transistor by reducing a potential of a gate terminal of the insulated gate transistor when the diode conducts a first electric current, wherein the diode has a sensing anode terminal for outputting a second electric current proportional to the first electric current, wherein the first sensing resistor is coupled between the anode and the sensing anode terminal of the diode, wherein a control terminal of the first control transistor is coupled to the anode of the diode, wherein the first current terminal of the first control transistor is coupled to the gate terminal of the insulated gate transistor, and wherein the second current terminal of the first control transistor is coupled to the sensing anode terminal of the diode.