LED DRIVER AND LED DRIVING METHOD
PURPOSE: An LED driving device and LED driving method are provided to automatically select a voltage boosting mode or a voltage dropping mode. CONSTITUTION: An output terminal(74,76) is connected between LED strings. A power transformer(38) converts an input voltage into a constant voltage. A switch...
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Main Authors | , , , |
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Format | Patent |
Language | English Korean |
Published |
09.06.2011
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Subjects | |
Online Access | Get full text |
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Summary: | PURPOSE: An LED driving device and LED driving method are provided to automatically select a voltage boosting mode or a voltage dropping mode. CONSTITUTION: An output terminal(74,76) is connected between LED strings. A power transformer(38) converts an input voltage into a constant voltage. A switch circuit(60) is connected to a bias node to apply a bias voltage to the bias node. A current source(22) is connected to the output terminal and connected to an LED string in series between the power transformer and the bias node. |
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Bibliography: | Application Number: KR20100007995 |