ماژول درایور استپر موتور Reprap A4988

Description:

The A4988 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full, half, quarter, eighth, and sixteenth step modes, with an output drive capacity of up to 35 V and 2 A. The A4988 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.

The translator is the key to the easy implementation of the A4988. Simply inputting one pulse on the STEP input drives the motor a microstep. There are no phase sequence tables, high-frequency control lines or complex interfaces to program.

The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

During stepping operation, the chopping control in the A4988 automatically selects the current decay mode, Slow or Mixed. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time.

Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

Features:

Max. theoretical current: 2A

Max. microsteps: 16

Stepper current adjust trimpot: Yes, near Dir pin

Typical Rs value: 0.05 Ohm or 0.1 Ohm or 0.2 Ohm

PCB layers: 2

Active cooling required: Recommended

IC packaging: 5x5mm 28-lead QFN

Simple step and direction control interface             

Full step, Half step, Quarter step, Eighth step, and Sixteenth step                     

Adjustable current control                     

Intelligent chopping control                     

Over-temperature thermal shutdown                     

Under-voltage lockout                     

Crossover current protection                     

Short to the ground and shorted load protection

Subdivision: 1, 1/2, 1/4, 1/8, 1/16