A3982 SLBT – IC
The A3982 is a complete stepper motor driver with a built-in translator that simplifies its operation. It can drive bipolar stepper motors in full- and half-step modes, with a maximum output of 35 V and ±2 A. The A3982 has a fixed off-time current regulator that can work in Slow or Mixed decay modes. The translator makes the A3982 easy to use. Just input one pulse on the STEP input and the motor moves one step. No need for phase sequence tables, high frequency control lines, or complex programming. The A3982 is ideal for applications where a complex microprocessor is not available or too busy. The A3982 automatically chooses the current decay mode (Slow or Mixed) based on the chopping control. When the STEP input pin receives a signal, the A3982 checks if the current in each motor phase increases or decreases as a result of the step. If it increases, the decay mode is Slow. If it decreases, the decay mode is Mixed (first fast decay for 31.25% of the fixed off-time, then slow decay for the rest of the off-time). This way of controlling current decay reduces motor noise, improves step accuracy, and lowers power consumption. The A3982 also has internal synchronous rectification control circuitry that enhances power efficiency during PWM operation. The A3982 has internal circuit protection features such as thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. No special power-on sequence is needed. The A3982 comes in a 24-pin wide-body SOIC (package LB) with internally fused power ground leads for better heat dissipation. It is lead (Pb) free, with a lead frame plated with 100% matte tin.
Features
â–ª Low RDS (on) outputs
â–ª Automatic current decay mode detection/selection
â–ª Mixed and Slow current decay modes
â–ª Synchronous rectification for low power dissipation
â–ª Internal UVLO and thermal shutdown circuitry
â–ª Crossover-current protection
Package Includes
1 x A3982 SLBT – IC
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