A3955SB

A3955SB Manufacturer

A3955SB Description

A3955SB Description

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A3955SB Datasheet (PDF)

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A3955SB Features

• 1.5 A Continuous Output Current
• 50 V Output Sustaining Voltage
• Internal PWM Motor 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

A3955SB Description

The 3955 is 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 non-linear digital-to-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eight-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.

Internal circuitry determines whether the PWM current-control circuitry operates in a slow (recirculating) current-decay mode, fast (regenerative) current-decay mode, or in a mixed current decay with the remainder of the fixed off time spent in slow current decay. The combination of user-selectable current-sensing resistor and reference voltage, digitally selected output current ratio; and slow, fast, or mixed current-delay modes provides users with a broad, variable range of motor control.

Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required.

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