HQ Reprap Stepper Driver pololu A4988 stepper motor driver module

Detail HQ Reprap Stepper Driver pololu A4988 stepper motor driver module

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A4988 is a complete microstepping motor driver with built-in translator for easy
operation. This product is available in full, half, 1/4, 1/8 and 1/16 step modes
operate bipolar stepper motors, output drive capacity of up to 35 V and 2 A.
A4988 includes a fixed off-time current regulator, the regulator in slow or
mixed decay modes. A4988 converter is the key to the easy implementation. As
long as the "step" input inputting one pulse drives the motor one microstep.
There are no phase sequence tables, high frequency control lines, or complex
interfaces to program. A4988 interface is very suitable for complex
microprocessor is unavailable or is overburdened.
In the micro-step operation, A4988 chopping control inside automatically selects
the current decay mode (Slow or Mixed). In mixed decay mode, the device is
initially set to a fixed downtime in some fast decay, then the rest of the slow
decay downtime. Mixed decay current control scheme results in reduced audible
motor noise, increased step accuracy, and reduced power consumption. Internal
synchronous rectification control circuitry is provided 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 surface mount QFN package (ES), a size of 5 mm 5 mm, nominal overall
package height of 0.90 mm, with an exposed pad for enhanced thermal dissipation.
This package is Pb (suffix-T), with 100% matte tin leadframe plating.

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