Controlling an LED string using a current sink with low side voltage regulation
AssigneeAdvanced Analogic Technologies, Inc.
InventorsKevin D'Angelo, Andrew Whyte, Gustavo Mehas
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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.
Claims20
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, the method comprising:
- generating a target voltage desired at a first end of an external inductor coupled to a 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.
Dependencies are inferred from the claim text.