Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

1995-03-13

1996-01-09

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 42, 361 86, H02H 710

Patent

active

054834040

ABSTRACT:
A semiconductor integrated circuit allows no through-current to flow to voltage-driven-type power control devices of an external circuit even when the grounding terminals are opened, thereby protecting the devices from breakdown. The semiconductor integrated circuit includes input terminals, a power terminal connected to a drive power source of power MOSFETs, control output terminals connected to control terminals of the power MOSFETs, a grounding terminal divided into at least two grounding terminals that are connected to each other in the exterior, a control logic section, a pre-driver section which outputs a drive control signal to the control terminals of the power MOSFETs and which causes a consumption current to flow to the second grounding terminal, and a consumption current detecting section including a first NPN transistor whose base is connected to the first grounding terminal and whose emitter is connected to the second grounding terminal and a second NPN transistor whose base is connected to the second grounding terminal and whose emitter is connected to the first grounding terminal, and detecting a flow of consumption current between the first and second grounding terminals and clamping the electric potential of the grounding terminal to a level not higher than the drive control potential of the power MOSFETs.

REFERENCES:
patent: 4649454 (1987-03-01), Winterton
patent: 4868702 (1989-03-01), Hertz et al.

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