Abstract: A drive circuit for an LED array, comprising at least two clusters of LEDs, in which one cluster comprises a number of LEDs arranged in series which are connected to a supply voltage (UBatt), with a semiconductor switch (T) being arranged in series between each LED cluster and the associated supply voltage, which semiconductor switch (T) allows the LED current to be supplied in a pulsed manner, with a measurement resistor (RShunt) being arranged in series with the LEDs in the path for the forward current IF between the LEDs and ground. A control loop controls the semiconductor switch (T1) in a first LED cluster, referred to as the master cluster in the following text, such that a constant mean value of the LED current is achieved, wherein the master cluster has a predetermined number X of LEDs in its cluster, and with this control loop also driving at least the semiconductor switch (T2) in a further, LED cluster, referred to in the following text as the slave cluster.

Abstract: The present invention relates to a drive circuit for an LED array which comprises a first LED cluster (40) and at least one second LED cluster (42; 44), the switch (S1, S2, S3) being arranged in series with each LED cluster (40, 42, 44), and each LED cluster (40, 42, 44) having a supply terminal. A control loop (46) is designed to drive the switch (S1) of the first LED cluster (42) so as to achieve a constant mean value of the current (ILED) flowing through the first LED cluster (42), the control loop (46) being designed for also driving the switches of the further LED clusters (42, 44). The drive circuit also comprises a total current detection device (RMMess) with the aid of which it is possible to determine an actual magnitude (UMess) which corresponds to the sum of the currents through at least two, in particular through all of the second LED clusters (42, 44).

Abstract: The drive circuit is suitable for an LED array, comprising a number of clusters of LEDs, with one cluster comprising a number of LEDs which are arranged in series and are connected to a supply voltage (UBatt). A semiconductor switch (transistor T) is arranged in series between the LED and the supply voltage and allows the LED current to be supplied in a pulsed manner. A measurement resistor (Rshunt) for measuring the LED current is arranged in series between the LED and ground, with a control loop controlling the semiconductor switch such that a constant mean value of the LED current is achieved.

Abstract: An optoelectronic component group has at least two LEDs (2) which are mounted on a support (3). The support is composed of a material having a thermal conductivity of better than 1.5 W/K×m, for example ceramic or composite material.