Light source driving circuit
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United States of America Patent
Stats
-
Jul 7, 2009
Grant Date -
Apr 24, 2008
app pub date -
Jul 10, 2007
filing date -
Oct 18, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A light source driving circuit for driving a light-emitting element is provided. The light source driving circuit includes a power supply circuit, a dimming circuit, and a feedback circuit. A first terminal of the dimming circuit is connected to a terminal of the light-emitting element, and a second terminal of the dimming circuit receives a supply voltage output from the power supply circuit. The dimming circuit determines an ON/OFF state between the first terminal and the second terminal according to a logic state of a pulse width signal. The feedback circuit is connected between the first terminal of the dimming circuit and a feedback terminal of the power supply circuit. The feedback circuit controls a level of the supply voltage output from the power supply circuit according to the ON/OFF state of the dimming circuit.
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