Light emitting diode array current power supply

Details Light emitting diode array current power supply Light emitting diode array current power supply

1990-10-12

1992-03-24

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323316, 323317, 3072961, 3072966, 346107R, 346108, 354 5, 354 7, G05F 326

Patent

active

050991922

ABSTRACT:
A power supply circuit for an LED print head has a reference current source connected to a printer system reference voltage for providing a second reference voltage for an individual, integrated circuit chip. The reference current source is controlled by an operational amplifier, the output of which comprises the second reference voltage. A plurality of output driver FETs are biased by the reference voltage. Each output driver FET provides current to an associated LED responsive to a data signal. A plurality of control FETs are connected in parallel with each other and in series with each output driver FET for varying the LED output current responsive to programming data signals. A second group of control FETs is interposed in the feedback loop of the operational amplifier for varying the second reference voltage responsive to a different set of programming data signals.

REFERENCES:
patent: 4780731 (1988-10-01), Creutzmann et al.
patent: 4864216 (1989-09-01), Kalata et al.

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