3955 Datasheet (Allegro MicroSystems) - FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

3955, FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

Slow Current-Decay Mode Mixed Current-Decay Mode Fast Current-Decay Mode ≥3.5 V 1.1 V to 3.1 V ≤0.8 V 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 W Copyright © 1997 Allegro MicroSystems, Inc.

3955 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER ALLOWABLE PACKAGE P

3955 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER PFD REF RC GROUND GROUND LOGIC SUPPLY PHASE D2 1 2 3 4 LOGIC 5 6 7 8 VCC 12 11 10 9 GROUND SENSE OUTA D1 VBB 16 15 14 13 LOAD SUPPLY OUTB D0 GROUND Data Sheet 29319.41 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 int

3955 Features

* s s s s s s s s ±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 Always or