IC having built-in over voltage protecting circuit

Details IC having built-in over voltage protecting circuit IC having built-in over voltage protecting circuit

1997-02-13

1998-07-14

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 18, H02H 320

Patent

active

057813914

ABSTRACT:
An IC having a built-in over voltage protecting circuit comprising: a first operating circuit having a first resistor connected to a terminal the voltage at which varies depending on a voltage at a first terminal; a second operating circuit; a protecting circuit having a second resistor, which receives a detection signal via the second resistor and controls the operation of the second operating circuit therewith to thereby protect the operation of the second operating circuit, wherein the first resistor and the second resistor are formed adjacently in a device-isolated common resistor forming land as regions having different conductivity type from that of the resistor forming land, the potential of the resistor forming land is set at a predetermined voltage which is different from the voltage at the first terminal, and the detection signal is generated, when a transistor which is composed by the first resistor, the second resistor and the resistor forming land is turned ON in response to a variation of the voltage at the first terminal by a value more than a predetermined value.

REFERENCES:
patent: 5072271 (1991-12-01), Shimizu et al.

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