Load drive device for expanding range of output power
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United States of America Patent
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Dec 10, 2013
Grant Date -
Dec 29, 2011
app pub date -
Jun 23, 2011
filing date -
Jun 23, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A load drive device capable of expanding a range of an output power by improving a linearity thereof when the output power varies. This device includes an output circuit (14) for supplying an electric power to an LED (10), a feedback circuit (28) for turning on or off the electric power supplied to the LED (10) according to a duty ratio of a burst signal to control the electric power and generating a control value for controlling the LED (10) based on an A/D-converted value obtained by detecting an output current (Iout) to the LED (10) to send out the control value to the output circuit when the supply of the electric power is in an on-state, a burst signal previous value correcting circuit (64) for correcting a presently generated control value (y) based on the A/D-converted value (V) and the previous control value (x) which are generated every cycle of the burst signal, and a duty ratio determination circuit (66) for allowing the burst signal previous value correcting circuit (64) to operate upon determining that the duty ratio of the burst signal goes above or below a reference value.
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