Using for 72mm brushless DC external rotor motor, stepless speed control, start and stop; speed feedback, Fault alarm functions. PFC ... range from 12VDC to 75VDC, 100% speed control by 0-10VDC or PWM signal, Max. power 50W, soft starting, etc.Main features ... of Brushless DC fan motor controller driver : Supply Voltage: 12~75VDCMax power: 50WSpeed control ...