A3957SLB
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Manufacturer Part#:

A3957SLB

Product Category: IC Chips
Manufacturer: ALLEGRO
Description:
  datasheetA3957SLB Datasheet
Package: SOP-24
Quantity: 23226 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: ALLEGRO
Product Category: IC Chips
Features, Applications

Features

FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

The A3957SA and A3957SLB 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 four-bit nonlinear digital-to-analog converter allows the motor current to be controlled in full-, half-, quarter-, eighth-, or sixteenth-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 mode in which the off time is divided into a period of fast 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-decay 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.


The A3957S— is supplied in a choice of two power packages; a 16-pin dual-in-line plastic package (suffix ‘A’), and a 24-lead plastic SOIC with copper heat-sink tabs (suffix ‘LB’). The power tab is at ground potential and needs no electrical isolation.


Specifications

·±1.5 A Continuous Output Current

·50 V Output Voltage Rating 

·Internal PWM Current Control 

·4-Bit Non-Linear DAC for 16-Bit Microstepping 

·Satlington Sink Drivers 

·Fast, Mixed Fast/Slow, and Slow Current-Decay Modes 

·Internal Transient-Suppression Diodes 

·Internal Thermal-Shutdown Circuitry 

·Crossover-Current and UVLO Protection


Search Part number : "A3957" Included word is 5
Part Number Manufacturer Package Quantity Description
A3957SLB-A ALLEGRO SOP-24 14408
A3957SLBT ALLEGRO SOP24 642
A3957SLBTR ALLEGRO SOP24 2560
A3957SLBTR-AESG ALLEGRO SOP-24 6940
A3957SLBTR-T Pb-free SOP 72945
A3957SLB RELATED PRODUCT PICTURE
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