Highly efficient driving of photoflash diodes using low and fixed voltage drop-out current sink
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United States of America Patent
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May 20, 2008
Grant Date -
Jun 1, 2006
app pub date -
Jun 8, 2005
filing date -
Nov 29, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit according to the present invention is used for driving a photoflash diode and comprises a current sink, a feedback circuit, and a DC-DC converter. The current sink is coupled to the photoflash diode for controlling the current through the photoflash diode. The feedback circuit receives a feedback signal indicative of the electrical condition of said first current regulator. The DC-DC converter is coupled to an external power source and the feedback circuit for powering the photoflash diode so as to control the electrical condition of the current sink to a predetermined value.
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