A driver for an array of current-driven LEDs, comprising - a voltage converter arranged to generate a supply voltage (V boost, V LED) to the LED array during operation and to adjust the supply voltage (V boost, V LED) in response to a feedback signal; - a plurality of current regulators (CS1,..., CSn) arranged to drive the LEDs of the LED array when the cathode of each LED is connected to a dedicated current regulator (CS1,..., CSn); and wherein the driver is characterized by a monitoring arrangement adapted to monitor the voltages (V CS1,..., V CSn) of the current regulators (CS1,..., CSn) relative to a voltage headroom and to generate the feedback signal on the basis of the headroom monitoring results, which monitoring arrangement comprises a plurality of window comparators (M1,..., Mn), wherein each window comparator (M1,..., Mn) comprises a comparator output (M out_1,..., M out_n) and a first operational amplifier and a first diode connected in forward direction between the output of the first operational amplifier and the comparator output (M out_1,..., M out_n); a second operational amplifier and a second diode connected in reverse direction between the output of the second operational amplifier and the comparator output (M out_1,..., M out_n); and wherein the inverting inputs of both operational amplifiers (A1, A2) are connectable to the cathode of the respective LED; the non-inverting input of the first operational amplifier is connected to a first input voltage (V ref_low) defining the lower bound of the voltage headroom; and the non-inverting input of the second operational amplifier is connected to a second input voltage (V ref_high) defining the upper bound of the voltage headroom, such that each window comparator is realised to generate a high comparator output when the respective LED cathode voltage (V a, V b, V c) is lower than the first input voltage (V ref_low) and to generate a low comparator output when that LED cathode voltage (V a, V b, V c) is higher than the second input voltage (V ref_high), and wherein the feedback signal comprises the bundled comparator outputs (M out_1,..., M out_n). - a voltage converter arranged to generate a supply voltage (V boost, V LED) to the LED array during operation and to adjust the supply voltage (V boost, V LED) in response to a feedback signal; - a plurality of current regulators (CS1,..., CSn) arranged to drive the LEDs of the LED array when the cathode of each LED is connected to a dedicated current regulator (CS1,..., CSn); a monitoring arrangement adapted to monitor the voltages (V CS1,..., V CSn) of the current regulators (CS1,..., CSn) relative to a voltage headroom and to generate the feedback signal on the basis of the headroom monitoring results, which monitoring arrangement comprises a plurality of window comparators (M1,..., Mn), wherein each window comparator (M1,..., Mn) comprises a comparator output (M out_1,..., M out_n) and a first operational amplifier and a first diode connected in forward direction between the output of the first operational amplifier and the comparator output (M out_1,..., M out_n); a second operational amplifier and a second diode connected in reverse direction between the output of the second operational amplifier and the comparator output (M out_1,..., M out_n); and wherein the inverting inputs of both operational amplifiers (A1, A2) are connectable to the cathode of the respective LED; the non-inverting input of the first operational amplifier is connected to a first input voltage (V ref_low) defining the lower bound of the voltage headroom; and the non-inverting input of the second operational amplifier is connected to a second input voltage (V ref_high) defining the upper bound of the voltage headroom, such that each window comparator is realised to generate a high comparator output when the respective LED cathode voltage (V a, V b, V c) is lower than the first input voltage (V ref_low) and to generate a low comparator output when that LED cathode voltage (V a, V b, V c) is higher than the second input voltage (V ref_high), and wherein the feedback signal comprises the bundled comparator outputs (M out_1,..., M out_n).