LB11946

Ordering number : ENN7946 LB11946 www.DataSheet4U.com Monolithic Digital IC PWM Current Control Stepping Motor Driver Overview The LB11946 is a stepping motor driver IC that implements PWM current control bipolar drive with a fixed off time. This IC features 15 current setting levels using a fixed VREF voltage and support for microstepping drive from 1-2 phase excitation drive to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as those used for carriage drive and paper feed in printers. Features PWM current control (with a fixed off time) Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2, and 4W1-2 phase excitation drive) Current attenuation switching function (with slow decay, fast decay, and mixed decay modes) Built-in upper and lower side diodes Simultaneous on state prevention function (through current prevention) Noise canceller function Thermal shutdown circuit Shutoff on low logic system voltage circuit Low-power mode control pin Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Peak output current Continuous output current Logic system supply voltage Logic input voltage range Emitter output voltage Allowable power dissipation (IC internal) Operating temperature Storage temperature Symbol VBB IO peak IO max VCC VIN VE VE Pdmax Topr Tstg VCC = 5 V specifications VCC = 3.3 V specifications Ta = 25°C, independent IC tw ≤ 20 µS Conditions Ratings 50 1.2 1.0 7.0 −0.3...