Product Description

• The A3955SB and A3955SLB are designed for driving one winding of a bipolar stepper motor in a microstepping mode.
• The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal pulse-width modulated (PWM) current control combined with an internal three-bit nonlinear digital-to-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (microstepping) modes. Nonlinear increments minimize the number of control lines necessary for microstepping. Microstepping provides for increased step resolution, and reduces torque variations and resonance problems at low speed.
• Technical sheet: https://pdf1.alldatasheet.fr/datasheet-pdf/view/55110/ALLEGRO/A3955SB.html

• ±1.5 A Continuous Output Current
• 50 V Output Voltage Rating
• Internal PWM Current Control
• 3-Bit Non-Linear DAC
• Fast, Mixed Fast/Slow, and Slow Current-Decay Modes
• Internal Transient-Suppression Diodes
• Internal Thermal-Shutdown Circuitry
• Crossover-Current and UVLO Protection

• Load Supply Voltage, VBB50 V=
• Output Current, IOUT(Continuous) = ±1.5 A*
• Logic Supply Voltage, VCC= 7.0 V
• Logic/Reference Input Voltage Range,VIN= -0.3 V to VCC= + 0.3 V
• Sense Voltage, VS= 1.0 V
• Operating Temperature Range, TA= -20 ̊C to +85 ̊C
• Junction Temperature, TJ= +150 ̊C†
• Storage Temperature Range, TS= -55 ̊C to +150 ̊C