Current regulator and method

Details Current regulator and method Current regulator and method

1988-05-17

1989-02-28

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, G05F 320

Patent

active

048089079

ABSTRACT:
An integrated circuit for providing a regulated output current comprises an output transistor for producing the output current, a feedback circuit including a current mirror for sensing the magnitude of the output current and providing a feedback current proportional thereto and a driver circuit for comparing the feedback current to an externally generated current and biasing the output transistor accordingly to regulate the magnitude of the output current to a predetermined value. Preferably, the external current is generated through an external resistor coupled to an input of the driver curcuit and the current mirror wherein the magnitude of the external current is directly proportional to a reference voltage provided on chip and applied to an additional input of the driver circuit the latter of which functions as an operational amplifier.

REFERENCES:
patent: 4251743 (1981-02-01), Hareyama
patent: 4361797 (1982-11-01), Kojma et al.
patent: 4703249 (1987-10-01), DeLaplaza et al.
patent: 4716358 (1987-12-01), Fucito
patent: 4740766 (1988-04-01), Metz

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