บอร์ดขับ สเตปปิ้งมอเตอร์ กระแสสูงสุด 1A Reprap Stepper Driver A4988

 

 

       A4988 is a complete micro-stepping motor driver with a built-in converter for easy operation. The product can operate bipolar stepping motors in full, half, 1/4, 1/8 and 1/16 stepping modes, and the output drive performance can reach 35 V and ±1 A. A4988 includes a fixed off-time current regulator, which can work in slow or mixed decay mode. The converter is the key to easy implementation of A4988. Just input a pulse in the "step" input to drive the motor to generate microsteps. No need for phase sequence table, high frequency control line or complicated interface programming. The A4988 interface is very suitable for applications where complex microprocessors are unavailable or overloaded.

 

       During micro-step operation, the chopper control in A4988 can automatically select the current decay mode (slow or mixed). In the mixed decay mode, the device is initially set to decay quickly during part of the fixed downtime, and then slowly decay during the rest of the downtime. The mixed decay current control scheme can reduce audible motor noise, increase step accuracy and reduce power consumption. Provides internal synchronous rectification control circuit to improve power consumption during pulse width modulation (PWM) operation. Internal circuit protection includes: thermal shutdown with hysteresis, under voltage lockout (UVLO) and cross current protection. No special power-on sequencing is required.

 

        The A4988 adopts a surface mount QFN package (ES) with a size of 5 mm × 5 mm, a nominal overall package height of 0.90 mm, and an exposed heat sink to enhance heat dissipation. The package is a lead-free package (suffix -T), using 100% matte tin plating lead frame.

 

 

 

Low R DS (open) output

Automatic current decay mode detection/selection

Mixed and slow current decay mode

Synchronous rectification for low power dissipation

Internal UVLO

Cross current protection

3.3 and 5 V compatible logic power supply

Thermal shutdown circuit

Ground short circuit protection

Load short circuit protection

Five optional stepping modes: full, 1/2, 1/4, 1/8 and 1/16