Abstract: A device includes a comparator having a first comparator input configured to receive a time signal. The device also includes a subtractor having a subtractor output coupled to a second comparator input, and a first subtractor input adapted to be coupled to a voltage converter terminal. The device also includes a current source having an output coupled to a second subtractor input, and a current source input coupled to the first subtractor input. The device also includes a capacitor coupled to the second subtractor input and to ground. The device also includes a latch having an output and first and second inputs. The latch output is coupled to a control terminal of a transistor in parallel with the capacitor, the first latch input is coupled to the comparator output, and the second latch input is configured to receive a clock signal.

Abstract: A converter circuit includes a power stage circuit configured to convert an input voltage to an output voltage provided at an output, and a control circuit configured to control the power stage circuit. The control circuit is configured to operate in one of a pulse frequency modulation (“PFM”) mode and a pulse width modulation (“PWM”) mode depending on a current supplied to the output. The control circuit includes a multi-mode timer circuit configured to provide a switching signal to set an off time for each switching cycle of the power stage circuit during the PFM mode and during the PWM mode.

Abstract: A converter circuit includes a power stage circuit configured to convert an input voltage to an output voltage provided at an output, and a control circuit configured to control the power stage circuit. The control circuit is configured to operate in one of a pulse frequency modulation (“PFM”) mode and a pulse width modulation (“PWM”) mode depending on a current supplied to the output. The control circuit includes a multi-mode timer circuit configured to provide a switching signal to set an off time for each switching cycle of the power stage circuit during the PFM mode and during the PWM mode.

Abstract: A converter circuit includes a power stage circuit configured to convert an input voltage to an output voltage provided at an output, and a control circuit configured to control the power stage circuit. The control circuit is configured to operate in one of a pulse frequency modulation (“PFM”) mode and a pulse width modulation (“PWM”) mode depending on a current supplied to the output. The control circuit includes a multi-mode timer circuit configured to provide a switching signal to set an off time for each switching cycle of the power stage circuit during the PFM mode and during the PWM mode.

Abstract: A method and apparatus comprises regulating, by a modulator of a LED controller, a plurality of current sinks to operate in a linear region of a current-to-voltage curve which is associated with a constant value of resistance, wherein each current sink is coupled to each of a plurality of LED strings, receiving, by the modulator, information of first current flowing through each of a plurality of LED strings, processing, by a control logic coupled to the modulator, the information of the first current, and based on the processed information of the first current, providing, by the control logic, at least two choices of information of second current that is to be flown through each respective LED string.

Abstract: A method comprises regulating, by a modulator of a LED controller, a plurality of current sinks to operate in a linear region of a current-to-voltage curve which is associated with a constant value of resistance, wherein each current sink is coupled to each of a plurality of LED strings, receiving, by the modulator, information of first current flowing through each of a plurality of LED strings, processing, by a control logic coupled to the modulator, the information of the first current, and based on the processed information of the first current, providing, by the control logic, at least two choices of information of second current that is to be flown through each respective LED string.