This constant current source modul (CCS-Modul) CCS2-100 able to supply with 100mA constant current one LED or several in series connected LEDs. Depending on application output current can be regulated by DIM input. The modul was developed special for space and reliability critical application. Integrated input and output filters allows interference free operation and at some time reduce current and voltage ripple at LED. High effeciency and as result sligth temperature rise allows operation without heatsink.