| 摘要 |
A switch circuit comprises a switch terminal 301, a reference potential terminal 302, a switch section 80 coupled between said switch terminal and said reference potential terminal producing a current path with a sufficiently low impedance between said switch terminal and said reference potential terminal in response to a conduction signal, a control terminal 304, a drive section 70 coupled between said control terminal and said switch section 80 generating said conduction signal in response to a control signal supplied to said control terminal 304, a voltage supply terminal, a current control section 200 coupled between said voltage supply terminal 303 and said drive section 70 blocking a current from said drive section 70 to said voltage supply terminal 303 and feeding a current from said voltage supply terminal to said drive section, said switch section including a first transistor 81 having an emitter coupled to said switch terminal 301 and a second transistor 82 having an emitter coupled to said reference potential terminal 302 and a collector coupled to the collector of said first transistor, and means for applying said conduction signal to the bases of said first and second transistors. |
