Controlling an LED string using a current sink with low side voltage regulation
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United States of America Patent
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Jan 10, 2017
Grant Date -
Oct 30, 2014
app pub date -
Jul 11, 2014
filing date -
Jun 30, 2011
priority date (Note) -
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Abstract
A method of controlling an LED string having a first end coupled to a power source and a second end coupled to a first end of a current sink is provided. The method include generating a target voltage at a first end of an external inductor coupled to the second end of the current sink, comparing the target voltage to a measured voltage at the first end of the external inductor, charging the external inductor responsive to the measured voltage being greater than the target voltage, and discharging the external inductor responsive to the measured voltage being less than the target voltage.
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