Stepper Motor Driver Stepstick A4988 Drv8825 With Heat Sink Carrier Reprap Ramps 3d Printer Parts

Stepper Motor Driver StepStick A4988 DRV8825 With Heat sink Carrier Reprap RAMPS 3D Printer Parts

A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. The product can be full, half, 1/4, 1/8, and 1/16 step mode to operate bipolar stepper motor output drive capacity of up to 35 V and ± 2 A. A4988 includes a fixed off-time current regulator, the regulator can slow or mixed decay mode. The converter is the key to the easy implementation of the A4988. In inputting one pulse on the STEP input drives the motor one micro-step. No phase sequence tables, high-frequency control lines, or complex interfaces to programming. A4988 interface is very suitable for complex microprocessor is unavailable or is overburdened. In the micro-step operation, the chopping control in the A4988 automatically selects the current decay mode (Slow or Mixed). In the mixed decay mode, the device is initially set to fast decay in the part of the fixed off-time, then a slow decay in the rest of the downtime. Mixed-decay current control scheme results in reduced audible motor noise, increased step accuracy, and reduced power consumption. Internal synchronous rectification control circuitry to improve the pulse-width modulation (PWM) power consumption when operating. Internal circuit protection includes thermal shutdown with hysteresis, under-voltage lockout (UVLO), and crossover current protection. Special power-Sort.

QUICK SPECS:
Low RDS (ON) outputs
Automatic current decay mode detection / selection
Mixed with slow current decay modes
Synchronous rectification for low power dissipation
Internal UVLO
Crossover-current protection
3.3 and 5 V compatible logic supply
Thermal shutdown circuitry
Ground Fault Circuit
Load short-circuit protection
Of five optional step mode: full, 1/2, 1/4, 1/8 and 1/16