Overview
●The LB1847 is a driver IC for stepping motors with PWM current control bipolar drive (fixed OFF time). A special feature of this IC is that VREF voltageis constant while the current can be set in 15 steps, allowing drive of motors ranging from 1-2 phase exciter types to 4W 1-2 phase exciter types. The current decay pattern can alsobe selected (SLOW DECAY, FAST DECAY, MIX DECAY) to increase the decay of regenerative current at chopping OFF,thereby improving response
●characteristics. This is especially usefulfor carriage and paper feed stepping motors in printers and similar applications where high-precision control and low vibrations are required.
●Features
●•PWM current control (fixed OFF time)
●•Load current digital selector (1-2, W1-2, 2W1-2, 4W1-2 phase exciter drive possible)
●•Selectable current decay pattern (SLOW DECAY, FAST DECAY, MIX DECAY)
●•Simultaneous ON prevention function (feed-through current prevention)
●•Noise canceler
●•Built-in thermal shutdown circuit
●•Built-in logic low-voltage OFF circuit
