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From Cape Verde

REES52 REES-4988 Stepper Motor Driver(with Heatsink, 2A)

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Product ID: 78102929
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About the item

  • Proven Allegro A4988 Stepper Motor IC.
  • Simple and proven "Step" and "Direction" control method.
  • High-temperature thermal shutdown, under-voltage lockout, and crossover current protection Built-in short protection.
  • 8-35VDC input 1.0A continuous current per phase (no heatsink nor airflow cooling) 2.0A continuous current per phase (with adequate heat-sinking/cooling) 3-5.5V logic input.
  • full, 1/2, 1/4, 1/8, and 1/16 microstepping modes Unsoldered (but included) header pins.
Operation Instructions- Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current. Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a sw step-down power supply). Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. Power connections: The driver requires a logic supply voltage (3 – 5.5 V) to be connected across the VDD and GND pins and a motor supply voltage of (8 – 35 V) to be connected across VMOT and GND. These supplies should have appropriate decoupling capacitors close to the board, and they should be capable of delivering the expected currents (peaks up to 4 A for the motor supply). Warning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver. (More generally, rewiring anything while it is powered is asking for trouble.
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