Flash Generating Device for LED and Flash Generating Method for LED
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United States of America Patent
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Issued Date -
Jul 18, 2013
app pub date -
Jan 27, 2012
filing date -
Feb 1, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided is a flash generating device for an LED, which has a small energy loss and a small system area. A flash generating device (1) is provided with: an input power supply (VIN) ; a large capacity capacitor (20); a step-down circuit (10) that is coupled between the input power supply (VIN) and one terminal of the large capacity capacitor; a step-up circuit (30) that is coupled between the one terminal of the large capacity capacitor and one terminal of the LED; and a constant current source (120) that is coupled between the other terminal of the LED and ground. An inductive element (L) whose one terminal is coupled to the large capacity capacitor, and a second transistor (M2) whose one terminal is coupled to the inductive element (L) and another terminal is coupled to the ground are shared constituent elements of both of the step-down circuit and the step-up circuit.
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