Transistor with current sensing function

Details Transistor with current sensing function Transistor with current sensing function

1990-06-04

1991-06-11

James, Andrew J.

357 27, 357 34, 357 51, H01L 2702, H01L 2722, H01L 2972, H01L 2982

Patent

active

050236938

ABSTRACT:
A transistor with current sensing function comprises a main transistor section for conducting a main current and a sense transistor section for sensing the magnitude of the main current. The main transistor section and the sense transistor section have a common collector region, respective individual base regions and respective individual emitter regions. This allows an external drive circuit to supply a base current to a respective base region. As a result, a high-accuracy current sensing function can be implemented without being affected by variations in current and temperature. In addition, by connecting current dividing resistances to the respective base regions of the main transistor section and the sense transistor section to divide a common base current at a constant ratio, the base regions can be regarded as an apparent single base. It thus becomes easy to drive the base. 148

REFERENCES:
patent: 4827322 (1989-05-01), Takata

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