3D printer A4988 Stepper Motor Drive Board Reprap Driver | Компьютеры и офис

3D printer A4988 Stepper Motor Drive Board Reprap Driver | Компьютеры и офис

• A4988 is a complete microstepping motor shall drive with built-in translator for easy operation . The product is available in Full, half , operate bipolar stepper motors when 1,4,1 / 8 lightning 1 /16 step model. 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 mode sets . Converter is easy to implement key A4988 . Just type in "step" input - pulses , drives the motor micro-step . Without the need for phase sequence tables, high frequency control lines, or complex interfaces to program . A4988 interface is very suitable station 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 units ) . In mixed units Decay mode , the device is initially set to fast decay in the part of the fixed off-time , and then a 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 . Special power sequencing.   A4988 using surface mount QFN package (Es). Size 5 mmx 5 mm, nominal overall package height 0.90 mm, with exposed pad for enhanced thermal dissipation. This package is Pb-free ( suffix -T), using 100% matte tin leadframe plating.