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ALLEGRO A3982SLBTR-T

Manufacturer
ALLEGRO
MPN
A3982SLBTR-T
LCSC Part #
C459277
Packaging
SOIC-24-300mil
Customer #
Key Attributes
DMOS Stepper Motor Driver with Translator
DatasheetALLEGRO A3982SLBTR-T
RoHS Compliance1 documents available
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QtyUnit Price(Reference Only)Total Amount
1+$ 3.8227$ 3.82
10+$ 3.7257$ 37.26
30+$ 3.6631$ 109.89
100+$ 3.5989$ 359.89
Standard Packaging1000/Full Reel
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Products Specifications

All
TypeDescription
CategoryIntegrated Circuits (ICs)/Power Management (PMIC)/Motor Drivers, Controllers
ManufacturerALLEGRO
PackagingSOIC-24-300mil
Drive TypeBipolar Driver
Number of H-bridges2
FeaturesMotor step-out prevention function;Power-on reset;Overcurrent Protection;Over temperature protection;Under-voltage lockout;Built-in charge pump;Dead-time / shoot-through protection
TechnologyYes
InterfaceSTEP/DIR
Operating Temperature-20℃~+85℃
Step Resolution1;2
Output Current2A
Control Voltage3V~5.5V
RDS(on)370mΩ
Motor Drive Voltage(Vm)8V~35V
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Introduction

AI Translation
  • Low RDS(on) outputs
  • Automatic current decay mode detection/selection
  • Mixed and Slow current decay modes
  • Synchronous rectification for low power dissipation
  • Internal UVLO and thermal shutdown circuitry
  • Crossover-current protection
  • The A3982 is a complete stepper motor driver with built - in translator for easy operation. It is designed to operate bipolar stepper motors in full - and half - step modes, with an output drive capacity of up to 35 V and ±2 A. The A3982 includes a fixed off - time current regulator which has the ability to operate in Slow or Mixed decay modes.
  • The translator is the key to the easy implementation of the A3982. Simply inputting one pulse on the STEP input drives the motor one step. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A3982 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.
  • The chopping control in the A3982 automatically selects the current decay mode (Slow or Mixed). When a signal occurs at the STEP input pin, the A3982 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to Slow decay. If the change is to a lower current, then the current decay is set to Mixed (set initially to a fast decay for a period amounting to 31.25% of the fixed off - time, then to a slow decay for the remainder of the off - time). This current decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.
  • Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation.
  • Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover - current protection. Special power - on sequencing is not required.
  • The A3982 is supplied in a 24 - pin wide - body SOIC (package LB) with internally - fused power ground leads for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin plated leadframe.
  • The A3982 is a complete stepper motor driver with a built - in translator for easy operation with minimal control lines. It is designed to operate bipolar stepper motors in full - and half - step modes. The currents in each of the two output full - bridges and all of the N - channel DMOS FETs are regulated with fixed off - time PMW (pulse width modulated) control circuitry. At each step, the current for each full - bridge is set by the value of its external current - sense resistor RS1 or RS2, a reference voltage (VREF), and the output voltage of its DAC (which in turn is controlled by the output of the translator).
  • At power - on or reset, the translator sets the DACs and the phase current polarity to the initial Home state, and the current regulator to Mixed Decay Mode for both phases. When a step command signal occurs on the STEP input, the translator automatically sequences the DACs to the next level and current polarity. The step resolution is set by input MS1.
  • When stepping, if the new output levels of the DACs are lower than their previous output levels, then the decay mode for the active full - bridge is set to Mixed. If the new output levels of the DACs are higher than or equal to their previous levels, then the decay mode for the active full - bridge is set to Slow. This automatic current decay selection improves stepping performance by reducing the distortion of the current waveform that results from the back EMF of the motor.
  • The RESET input sets the translator to a predefined Home state, and turns off all of the DMOS outputs. All STEP inputs are ignored until the RESET input is set to high.
  • A low - to - high transition on the STEP input sequences the translator and advances the motor one increment. The translator controls the input to the DACs and the direction of current flow in each winding. The size of the increment is determined by input MS1.
  • The DIR input determines the direction of rotation of the motor. When low, the direction will be clockwise and when high, counterclockwise. Changes to this input do not take effect until the next STEP rising edge.
  • Each full - bridge is controlled by a fixed off - time PWM current control circuit that limits the load current to a desired value.

Features

AI Translation
  • Low RDS(on) outputs
  • Automatic current decay mode detection/selection
  • Mixed and Slow current decay modes
  • Synchronous rectification for low power dissipation
  • Internal UVLO and thermal shutdown circuitry
  • Crossover - current protection