Controller for a buck-mode boost converter with regulated output current and LED driver circuit

摘要

An LED driver circuit that includes a buck-mode boost converter (209) that provides a regulated output current and that requires only a single connection to each channel of LEDs. The buck-mode boost controller may include a current regulator (215) that includes an integrator (217). The current regulator (215) may be configured to integrate a difference between a reference signal (219) that is representative of the desired level of the average current through the electronic power switch and a detected signal that is representative of the actual current that is being delivered to the buck-mode boost circuit (209) through the electronic power switch. The reference signal (219) to the integrator (217) may not change during operation of the buck-mode converter. The current regulator (215) may be configured to deactivate the integrator (217) and/or to disconnect the detected signal from the integrator (217) while the electronic power switch is off.