A4988 is a completely, micro step motor driver with built-in converter, easy to operate. The product can be in full, half, 1/4, 1/8 and 1/16 step mode operation bipolar stepper motor, the output driving performance can be up to 35 V and + / - 2 A. A4988 includes a fixed current regulator close time, the voltage stabilizer can work in a slow or mixed decay modes. The converter is the key to A4988 is easy to implement. As long as in the "step" input a pulse input, can produce micro-step driving motor. Don't need to control the phase sequence table, high frequency line or complex interface programming. A4988 interface is very suitable for the application of complex microprocessor is unavailable or overload.
In micro step is running, the chopping control for A4988 can automatically select current attenuation mode (slow or mixed). In hybrid damping model, the initial setting for device in a part of the fixed stop time fast attenuation, and then the rest of the downtime slow attenuation. Mix or decaying current control scheme can reduce the motor can be heard the noise and increase the precision stepper and reduce power consumption. Provide internal synchronous rectifier control circuit, in order to improve the pulse width modulation (PWM) operation of the power consumption. Internal circuit protection includes: take off the overheating of lag, under-voltage lockout (UVLO) and crossover current protection. Don't need special electricity sorting.
A4988 QFN package (ES) surface installation is adopted, the size is 5 mm x 5 mm, on the surface layer contains the radiator, and with naked cooling plate to strengthen the function of heat dissipation. The encapsulation of lead-free packaging (suffix - T), with 100% fog box tin plating pin.