Driving circuit for providing constant current
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United States of America Patent
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May 11, 2010
Grant Date -
May 29, 2008
app pub date -
Nov 28, 2006
filing date -
Nov 28, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A driving circuit comprising a reference-voltage circuit, an amplifier, an adjusting circuit, and a current-setting circuit. The reference-voltage circuit is used for generating a reference voltage. The amplifier comprises a first input terminal used for receiving the reference voltage, a second input terminal used for receiving feedback voltage from a load, and an output terminal used for outputting an output current to the load. The adjusting circuit is used for adjusting a voltage of the load when a resistance of the load changes. The current-setting circuit is used for setting a value of the output current based on the feedback voltage.
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