Patent ID: 8928373
Filing Date: 2015-01-06
Classification: F02P,H03K

Abstract:
1. A semiconductor device performing a current control function including a self shut down function, the semiconductor device comprising: a first insulated gate type transistor that ON/OFF controls a main current with a driving signal; a second insulated gate type transistor that is ON/OFF controlled with the driving signal and has a collector terminal common to the first insulated gate type transistor; a sense resistor that is connected in series with the second insulated gate type transistor at an emitter terminal thereof; a current control circuit that detects a voltage across the sense resistor and controls the main current flowing through the first insulated gate type transistor; and a gate control circuit that receives the driving signal and controls a first gate voltage for the first insulated gate type transistor and a second gate voltage for the second insulated gate type transistor; wherein the current control circuit comprises: wherein the reference voltage is gradually decreased with the pulse current in self shut down operation to gradually decrease the main current flowing through the first insulated gate type transistor.