LB1847

Ordering number : EN5982A LB1847 Monolithic Digital IC PWM Current Control Type Stepping Motor Driver http://onsemi.com 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 voltage is 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 also be selected (SLOW DECAY, FAST DECAY, MIX DECAY) to increase the decay of regenerative current at chopping OFF, thereby improving response characteristics. This is especially useful for 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 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Output peek current Output continuous current Logic supply voltage Logic input voltage range Emitter output voltage Allowable power dissipation Operating temperature Storage temperature Symbol VBB IO peak IO max VCC VIN VE Pd max Topr Tstg tW = 20μ...