Voltage Generating Circuit, Constant Current Circuit and Light Emitting Diode Driving Circuit
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United States of America Patent
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Issued Date -
Feb 28, 2008
app pub date -
Oct 26, 2005
filing date -
Nov 30, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A voltage generating circuit includes a voltage generating unit which generates plural constant voltages, plural switches, a control signal generating unit and a decoding circuit. The switches select any one of the plural constant voltages generated from the voltage generating unit and outputs it from a voltage output terminal. The control signal generating unit generates plural control signals which are switched between a high level and a low level through trimming on plural fuse resistors. The decoding circuit controls the state of connection of the switches-according to the control signals. The reference voltage Vx output from the voltage output terminal is applied to an electric-current generating resistor through an operational amplifier and a transistor to generate a constant electric current.
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