Intersil Americas Inc.

Xiping Yang

Congzhong Huang

Sisan Shen

Xuelin Wu

Jian-Song Chen

A method of regulating voltage with a switching regulator is disclosed. The method includes sensing an output voltage provided by the regulator. If the output voltage drops below a low voltage threshold, a burst of one or more current pulses is provided. If the output voltage raises above a high voltage threshold during the burst, discontinuing the burst of current pulses. The method includes counting a number of the one or more current pulses in the burst, and comparing the number of the one or more current pulses with at least one pulse threshold. The upper current threshold is adjusted based on the number of the one or more current pulses.

Current pulse count control in a voltage regulator

A multi-channel LED driver includes a plurality of linear current regulators, each connected to a bottom of a string of series connected LEDs of a multi-channel LED that controls a bias current and the string of series connected LEDs responsive to an LED bias reference voltage. A dynamic headroom regulation voltage control circuit monitors the headroom regulation voltage at the bottom of each string of the series connected LEDs in the multi-channel LED and generates a reference voltage controlling each of the headroom regulation voltages responsive to the LED bias reference voltage.

LED driver with adaptive dynamic headroom voltage control

A synthetic ripple regulator including frequency control based on a reference clock. The regulator includes an error network, a ripple detector, a combiner, a ripple generator, a comparator network and a phase comparator. The error network provides an error signal indicative of relative error of the output voltage. The ripple detector provides a ramp control signal based on the input and output voltages and a pulse control signal. The combiner adjusts the ramp control signal based on a frequency compensation signal to provide an adjusted ramp control signal. The ripple generator develops a ripple control signal based on the adjusted ramp control signal. The comparator network develops the pulse control signal to control switching based on the error signal and the ripple control signal. The phase comparator compares the pulse control signal with the reference clock and provides the frequency compensation signal.

Growing community of inventors

Plano, TX, United States of America

Xiping Yang