LED controller with current ripple control and method for controlling an LED device

摘要

An LED controller circuit (20) that can be coupled to an LED device (10), the LED controller circuit (20) comprising: a first circuit node for receiving a current measurement signal (ViL) which is one of the LED devices (10 ) the supplied load current (iL); a comparator (K) which is coupled to receive the current measurement signal (ViL) and which is used to compare the current measurement signal (ViL) with an upper threshold value (VREF + VTH1) and with a lower threshold value (VREF- VTH2) a load transistor (TL) which can be coupled to the LED device (10) and which is used to provide the load current (iL) to the LED device (10) in accordance with a comparator output signal (K) provided by the comparator (K). VG) is trained; anda ripple control circuit (202) which is designed to set the upper threshold value (VREF + VTH1) and the lower threshold value (VREF-VTH2) as a function of a comparison of the current measurement signal (ViL) with a first intermediate threshold value (Vmin50).