Fast switching circuit for lateral PNP transistors

Details Fast switching circuit for lateral PNP transistors Fast switching circuit for lateral PNP transistors

1984-08-20

1987-02-17

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307475, 307270, 307557, H03K 19092, H03K 1901

Patent

active

046441867

ABSTRACT:
A circuit (100) is shown which provides a large turn-on current drive to the base of a lateral PNP transistor (218) by forcing a large voltage drop across the base-emitter junction of the lateral PNP transistor in order to quickly turn on the PNP transistor. A current sensing circuit (203, 166) determines when the collector current in the PNP transistor is sufficient for proper operation of the rest of the circuitry dependent upon this PNP transistor. The current sensing circuitry then limits the base drive applied to the PNP transistor to the current level necessary to maintain the required quiescent collector current in the PNP transistor. In addition, means (190, 200) are provided to quickly clamp the base of the PNP transistor to the emitter of the PNP transistor thereby quickly turning off the PNP transistor.

REFERENCES:
patent: 4318011 (1982-03-01), Zeis
patent: 4404478 (1983-09-01), Rischmuller
patent: 4533839 (1985-08-01), Balakrishnan

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