| 摘要 |
PROBLEM TO BE SOLVED: To provide a control circuit of a semiconductor device with an overheat protection function having high reliability in simple constitution and to certainly work. SOLUTION: This control circuit of the semiconductor device with the overheat protection function is furnished with a driving circuit 3 to apply driving voltage on the semiconductor device 4 with the overheat protection function in accordance with a PWM signal supplied from outside and an electric current detection circuit 2 to output a detection signal when a driving electric current flowing in the semiconductor device 4 with the overheat protection function exceeds a previously set threshold value electric current. The driving circuit 3 sets off a semiconductor element when a cutoff circuit constituting the semiconductor device 4 with the overheat protection function cuts off input of the semiconductor element, changes the driving voltage to specified voltage so that the driving electric current exceeds the threshold value electric current and holds the driving voltage at the specified voltage while the detection signal is output from the electric current detection circuit 2. COPYRIGHT: (C)2007,JPO&INPIT |
