Low voltage detecting circuit

Details Low voltage detecting circuit Low voltage detecting circuit

1994-05-13

1995-03-28

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327 72, 327306, 327313, 327327, 327427, 327432, H03K 508

Patent

active

054020204

ABSTRACT:
Disclosed herein is a circuit for limiting the output current I.sub.O of a power MOSFET T.sub.1. A resistor R.sub.2 converts the current I.sub.O into a low voltage V.sub.0. The low voltage V.sub.O is detected by a low-voltage detecting circuit. When the low voltage V.sub.O is higher than a predetermined value V.sub.OL, the output current I.sub.O of the power MOSFET T.sub.1 is limited. The low-voltage detecting circuit comprises bipolar transistors Q.sub.1 to Q.sub.4. The base and collector of the transistor Q.sub.1 are connected to each other. The collector of the transistor Q.sub.2 is connected to the emitter of the transistor Q.sub.1. The base and emitter of the transistor Q.sub.3 are connected to the bases of the transistors Q.sub.1 and Q.sub.2, respectively. The base and collector of the transistor Q.sub.4 are connected to the emitters of the transistors Q.sub.1 and Q.sub.3, respectively. The low voltage V.sub.O is applied to the node between the emitters of the transistors Q.sub. 2 and Q.sub.4.

REFERENCES:
patent: 3845405 (1974-10-01), Leidich
patent: 4533845 (1985-08-01), Bynum et al.
patent: 4590392 (1986-05-01), Vu
patent: 5111071 (1992-05-01), Kwan et al.
Donald L. Zaremba Jr., "How Current Sense Technology Improves Power MOSFET Switching Applications", 8079 Electro/86 and Mini/micro Northeast 11 Conference Record, Los Angeles, Ca., pp. 1-4 (1986).

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