Method and circuit for control of saturation current in voltage

Details Method and circuit for control of saturation current in voltage Method and circuit for control of saturation current in voltage

1995-06-07

1996-08-20

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323280, 323281, G05F 144

Patent

active

055482058

ABSTRACT:
A voltage regulator employs a PNP output transistor of vertical construction, which operates as a linear control element in a feedback controlled circuit which is formed in a substrate. A differential amplifier has one input coupled to a voltage reference and another input coupled via feedback from a resistive voltage divider connected between common and the output of the voltage regulator. A parasitic NPN transistor, which is merged physically and thermally with the structure of the PNP output transistor, senses the onset of output transistor saturation and re-routes the majority of the excess base current drive to a feedback control node. The feedback control node retards total excess drive via a reduction in drive amplifier gain and bandwidth thereby assuring good stability of feedback loop operation during all phases of saturation, without the need for additional frequency compensating elements.

REFERENCES:
patent: 4760434 (1988-07-01), Tsuzuki et al.
patent: 4794277 (1988-12-01), Holland
patent: 5119263 (1992-06-01), Gariboldi et al.
patent: 5132556 (1992-07-01), Cheng
National Semiconductor Low Voltage Databook, "LM1577/LM2577 Series Simple Switcher Step-up Voltage Regulator", 1992 Edition, cover page, pp. i-ii and 4-121 to 4-136.
Block and Schematic Diagrams of National Semiconductor LM1577 pp. 1 to 9. Jun. 23, 1987.

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