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STEPSTK-DRV8825
DRV8825 stepper motor controller - micro-step, high current
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This DRV8825 stepper motor control breakout is based on the Texas Instrument DRV8825 which can drive a stepper motor in micro-stepping (micro step). The module has a pinout and interface almost identical to our A4988 stepper motor controller. It can therefore be directly used as a replacement on the various interface boards with this high performance model.
The DRV8825 incorporates an active and adjustable current limiter. You also have protection against overcurrent, overheating with 6 micro-stepping resolutions (up to 1/32 of a step). It operates between 8.2 and 45 V and can deliver approximately 1.5 A per phase without cooling or forced air - designed for 2.2A per coil using an efficient/adequate cooling system.
We recommend that you read the DRV8825 datasheet (1Mb pdf) and our tutorial carefully before using the product. This driver is capable of controlling a bipolar stepper motor with a current of up to 2.2 Amp per coil (see the section dedicated to Heat Dissipation for more information).
This stepper motor driver has an active current limiting circuit. This is a pretty incredible feature because it allows you to drive stepper motors with higher voltage without grilling the motor.
Suppose you have a motor designed for 2.8V at 1.7 amps. If it is supplied directly with a voltage of 5.6 Volts (twice as an example) then the coil would pass a current of 3.4 Amp.
However, at 3.4 Amp, the coil heats up so much that the motor quickly burns out (the heating increases with the square of the current!).
But if you have a circuit actively limiting the current, you could set it to 1.7A max (or 1.5A, the maximum of the DRV8825).
Therefore, even if you supply the motor with 5.6v, the current cannot exceed 1.7 Amp (1.5A for the DRV8825) and the motor doesn't burn out.
What are the advantages of using a higher voltage?
Regarding the 2.8V 1.7Amp motor mentioned, you could control it with a 9V power supply (confirmed by Pololu) with a DRV8825 by actively limiting the current to 1.5Amp (the maximum tolerated by the DRV8825 without cooling).
Here are some of the key features:
The DRV8825 stepper motor driver with a pinHeader section (16 pins, 2.54mm impaction). The pinHeader can be soldered onto the board if you want to use it with a breadboard. You can also directly solder the motor wires and control signals directly on the board.
Caution: If you weld the pinHeaders on the board with the silkscreen above, this has the advantage of making pin identification very easy but the disadvantage of making the current limiting potentiometer almost inaccessible. If you want to drive it with this orientation, we recommend that you make the current limit setting before welding the connectors.