Low voltage lockout circuit

Details Low voltage lockout circuit Low voltage lockout circuit

1988-08-22

1992-06-16

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

340663, H02H 324

Patent

active

051229200

ABSTRACT:
An integrated circuit is shown in which provision is made for terminating or locking out the operating circuitry when the supply voltage has fallen below a level that can cause anomalous or unreliable operation. Certain selected transistors are provided with saturation sensors which operate to produce a current when the transistors go into collector saturation. When any of the sensors indicates the onset of saturation, clamping circuitry is energized to provide lock out. In addition, a temperature compensated dummy bandgap circuit is included to sense extremely low supply voltages and provide the lockout function under conditions where a reliable saturation indication might not be available.

REFERENCES:
patent: 4463271 (1984-07-01), Gill, Jr.
patent: 4789917 (1988-12-01), Miller

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