Adaptive transistor drive circuit

Details Adaptive transistor drive circuit Adaptive transistor drive circuit

1986-11-18

1988-07-05

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323285, 307297, 330296, G05F 144

Patent

active

047557419

ABSTRACT:
An adaptive transistor drive circuit including a multiple-emitter transistor, at least one emitter of which is connected to the drive circuit. When the drive current causes the transistor to saturate, the emitter connected to the drive circuit conducts a portion of the drive current to limit saturation of the transistor. A current source provides drive current which varies as a function of the current conducted by the collector of the transistor so as to maintain the transistor in saturation as the collector current and operating temperature vary.

REFERENCES:
patent: 4228404 (1980-10-01), Widlar
patent: 4564769 (1986-01-01), Melamed
patent: 4595974 (1986-06-01), Lethellier
patent: 4645945 (1987-02-01), de Sartre
Dynamic Transistor Antisaturation Control, K. H. Knickmeyer, IBM Technical Disclosure Bulletin vol. 17, No. 4, Sep. 1974, pp. 1091-1092.
Data sheet, "LM117/LM217/LM317 3-Terminal Adjustable Regulator", National Semiconductor Corporation, 1982.
Application Note AN-110, "Fast IC Power Transistor with Thermal Protection", May 1974, National Semiconductor Corporation.
Data Sheet, "LT1005M/LT1005C Logic Controlled Regulator", Linear Technology Corporation, 1985.
Data sheet, "LT1001 Precision Operational Amplifier", Linear Technology Corporation, 1985.
Preliminary LT 1070, Data sheet, pp. 10-14 to 10-17, Linear Technology Corporation Data book 1986.

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