Semiconductor device and switching circuit

摘要

A semiconductor device includes: a main switching element, a current-sensing switching element and a surge protection element, which are formed on a single semiconductor substrate, wherein the surge protection element is a bidirectional diode connected between a first main electrode of the main switching element and a first main electrode of the current-sensing switching element. Also, a switching circuit includes the semiconductor device and a detection resistor connected to the first main electrode of the current-sensing switching element; and a driving device that drives the semiconductor device based on a voltage drop occurring in the detection resistor when the semiconductor device is turned on.

主权项

1. A semiconductor device comprising:
a main switching element, a current-sensing switching element and a surge protection element, which are formed on a single semiconductor substrate, wherein the surge protection element is a NPN bidirectional diode having a first terminal connected to a first main electrode of the main switching element and a second terminal connected to a first main electrode of the current-sensing switching element, the bidirectional diode breaking down causing a current to flow in a breaking down condition that a voltage applied across both ends exceeds a predetermined withstanding voltage.