Abstract: There is disclosed a driver for driving a series arrangement being a variable number of strings of LEDs wherein each string has a capacitance connected in parallel with the respective string; the driver comprising: a controllable current source adapted to be connected in series between the series arrangement and a rectified AC supply to and source a controllable current (Istr) through the series arrangement; and a current source controller adapted to control the controllable current source; wherein the current source controller is operable to source a relatively lower current (ILED?) when a difference (Vstr3A) between the voltage across the series arrangement and the voltage of the rectified AC supply is relatively higher and a relatively higher current (ILED) when the difference is relatively lower. Associated driver circuits and lighting circuits, and methods are also disclosed.

Abstract: There is disclosed a driver for driving a series arrangement being a variable number of strings of LEDs wherein each string has a capacitance connected in parallel with the respective string; the driver comprising: a controllable current source adapted to be connected in series between the series arrangement and a rectified AC supply to and source a controllable current (Istr) through the series arrangement; and a current source controller adapted to control the controllable current source; wherein the current source controller is operable to source a relatively lower current (ILED?) when a difference (Vstr3A) between the voltage across the series arrangement and the voltage of the rectified AC supply is relatively higher and a relatively higher current (ILED) when the difference is relatively lower. Associated driver circuits and lighting circuits, and methods are also disclosed.

Abstract: A buck converter is disclosed comprising a series combination of high-side and low-side switches, and including a protection switch in anti-series with the high-side switch. The protection switch is controlled by means of a shutter switch, which is powered from the output of the converter and gated from the half bridge node of the converter. Also disclosed is a photovoltaic system comprising such a buck converter and a solar panel.

Abstract: A buck converter is disclosed comprising a series combination of high-side and low-side switches, and including a protection switch in anti-series with the high-side switch. The protection switch is controlled by means of a shutter switch, which is powered from the output of the converter and gated from the half bridge node of the converter. Also disclosed is a photovoltaic system comprising such a buck converter and a solar panel.

Abstract: A Static Random Access Memory comprising a matrix arrangement of cells, each cell comprising:—a bistable loop of a first inverter and a second inverter, in which an input of the first inverter is coupled to an output of the second inverter at a first bistable node and an input of the second inverter is coupled to an output of the first inverter at a second bistable node;—a first access transistor connected between the first bistable node and a write bitline, the first access transistor having a control terminal connected to a write wordline, and—a second access transistor connected between the second bistable node and a line being the complement of the write bitline, the second access transistor having a control terminal connected to the write wordline wherein—a first separate read port is connected between a read bitline and a source potential, which first read port has at least two control terminals, one control terminal being connected to the second bistable node and one to a read wordline, and—a second se