DRV8825 Motor Driver 3D printer RAMPS 1.4

Overview

This product is a carrier board or breakout board for TI’s DRV8825 stepper motor driver; we therefore recommend careful reading of the DRV8825 datasheet (1MB pdf) before using this product. This stepper motor driver lets you control one bipolar stepper motor at up to 2.2 A output current per coil (see the Power Dissipation Considerations section below for more information).

Introduction

1. The calculation method of driver current: i = vref x 2 potentiometer has three pins, the voltage Vref is with a multimeter test for the 8825 direction of the pin, the current can be adjusted by potentiometer . It will increase clockwise, oppositely , reduce counterclockwise.

Refer to the following picture:

2. The normal wiki 8825 defaults Vref about 1.6v,current 3.2A. So it will easily burn and break if not adjust the current before use .

3. MKS 8825 defaults Vref about 0.65V,current 1.3A(Max 2.5A), after optimization design, so that it will use more safely .

Features

1. Simple step and direction control interface.

2. Six different step resolutions: full-step, half-step, 1/4-step, 1/8-step,1/16-step, and 1/32-step.

3. Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates.

4. Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay).

5. 45V maximum supply voltage.

6. Built-in regulator (no external logic voltage supply needed).

7. Can interface directly with 3.3 V and 5 V systems.

8. Over-temperature thermal shutdown, over-current shutdown,and under-voltage lockout.

9. Short-to-ground and shorted-load protection.

10. 4-layer, 2 oz copper PCB for improved heat dissipation.

11. Exposed solderable ground pad below the driver IC on the bottom of the PCB.

12. Module size, pinout, and interface match those of our A4988 stepper motor driver carriers in most respects (see the bottom of this page for more information).

DRV8824 stepper motor driver carrier that can serve as a direct substitute for the DRV8825 carrier when using lower-current stepper motors.The DRV8824 can only deliver up to 0.75A per coil without a heat sink (1.2A max with proper cooling), but it has larger current-sense resistors that allow for better microstepping performance than the DRV8825 carrier at low currents.

Enlace de referencia: reprap.org/wiki/MKS_DRV8825