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KEYES A4988 Stepper Motor Driver Module for RepRap 3D Printer (4PCS)
A4988 is a complete microstepping motor driver with built-in translator for easy operation. The product is available in full£¬ half £¬ 1/4£¬ 1 / 8 and 1 /16 step mode to operate bipolar stepper motors of an output drive capability of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator£¬ the regulator can operate in slow or mixed decay modes. Converter is easy to implement key for A4988. Just enter a pulse in the "step" input drives the motor to produce micro-step. Without the need for phase sequence tables£¬ high frequency control lines£¬ or complex interfaces to program. A4988 interface is ideal for complex microprocessor is unavailable or overloaded applications. In the micro-step operation£¬ the chopper control A4988 automatically selects within the current decay mode ( slow or mixed ). In mixed decay mode£¬ the device is initially set to a fixed part of the rapid decay in downtime and slow decay for the remainder of downtime. Mixed decay current control scheme results in reduced audible motor noise£¬ increased step accuracy£¬ and reduced power consumption. Internal synchronous rectification control circuitry provides to improve the pulse-width modulation (PWM) operation power consumption. Internal circuit protection includes: thermal shutdown with hysteresis £¬ undervoltage lockout (UVLO) and crossover current protection. No need special power sequencing. A4988 uses surface mount QFN package (ES)£¬ size of 5 mm x 5 mm£¬ containing a radiator on the surface layer£¬ with exposed pad for enhanced thermal dissipation. This package is Pb-free ( suffix -T)£¬ with 100% matte tin leadframe plating.