Driving circuit for controlling output voltage to be applied to

Details Driving circuit for controlling output voltage to be applied to Driving circuit for controlling output voltage to be applied to

1989-01-31

1990-06-12

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

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

323277, 323280, G05F 1565

Patent

active

049336258

ABSTRACT:
The disclosed driving circuit is composed of a driving transistor connectable to a load in accordance with an input signal, a first control device operating in case of driving the load having a relatively large resistance for producing a first control signal effective to control the driving transistor to drive the load by a constant-voltage type operation, a second control device operating in case of driving the load having a relatively small resistance for producing a second control signal effective to control the driving transistor to drive the load by a constant-current type operation, and a selecting device selectively applying either of the first and second control signals to the driving transistor according to the value of the load resistance connected to the driving transistor.

REFERENCES:
patent: 3538423 (1970-11-01), Goleniewski
patent: 4814687 (1989-03-01), Walker

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