Method and apparatus for current derating with integrated temperature sensing
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United States of America Patent
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Jul 14, 2015
Grant Date -
Jan 16, 2014
app pub date -
Jul 13, 2012
filing date -
Jul 13, 2012
priority date (Note) -
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Abstract
A method and apparatus for derating current and for derating current for a camera flash. The method comprises monitoring a local junction temperature of a module. The local junction temperature is converted into a local junction current. The local junction current is then compared with a reference current, which is independent of temperature. After the current comparison and subtraction is made, a derate control current is obtained to generate the LED reference current. After the temperature crosses the temperature threshold, the derate control current is derated. Both the temperature threshold and current derate slope are programmable and precisely controlled. The LED output current is regulated and proportional to the LED reference current. If the local junction temperature is greater than the temperature threshold, the LED output current is derated at the moment of the camera flash to avoid thermal overload.
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