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US 2014/0210360 A1Published application
Led driver with extended dimming range and method for achieving the same
OwnerAlexander Mednik, Rohit Tirumalainventors
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Abstract
A circuit for powering of a Light Emitting Diode (LED) string has a switching power converter. A brightness control circuit is coupled to the switching power converter to allow a duration of a conductive state of the power converter to exceed a duration of a conductive state of the LED string for maintaining a current magnitude in the LED string constant.
Claims3
A method of achieving wide dimming range in an LED driver of a boost type having an inductor and a current control feedback comprising:
- storing a state of a current control feedback upon a falling edge of the PWM signal;
- and
- disabling switching of the LED driver after the falling edge of the PWM signal and upon an inductor meeting a reference corresponding to a stored state of a current control feedback.
Dependencies are inferred from the claim text.