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          • [로봇사이언스몰][Pololu][폴로루] Pololu High-Power Stepper Motor Driver 36v4 #3730
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          This discrete MOSFET stepper motor driver enables control of one bipolar stepper motor. It supports a wide 8 V to 50 V operating voltage range and can deliver up to 4 A continuous per phase without a heat sink or forced air flow (6 A max with sufficient additional cooling). The SPI interface allows configuration of the current limiting, step mode (9 step modes from full-step through 1/256-step), decay mode, and stall detection. The driver also provides back-EMF feedback that can be used for more advanced control and stall detection algorithms. Additional features include reverse-voltage, under-voltage, and over-current protection.

          The Pololu High-Power Stepper Motor Driver 36v4 combines the DRV8711 stepper motor driver IC from Texas Instruments with external MOSFETs to enable control of large bipolar stepper motors at operating voltages from 8 V to 50 V. The DRV8711 has many configurable settings, so please see the DRV8711 datasheet for a detailed explanation of its features and how to use them (we also have an Arduino library that simplifies getting started by providing basic functions for configuring and operating the driver).

          The driver’s power performance is a function of the external dual H-bridges, which allow the driver to deliver continuous currents up to 4 A per phase without any additional cooling such as heat sinks or forced air flow. (With sufficient additional cooling, the driver can support currents up to around 6 A per phase; see the Power dissipation considerations section below for more information, including important information about using this product safely.)

          Pololu High-Power Stepper Motor Driver 36v4, bottom view with dimensions.
          Pololu High-Power Stepper Motor Driver 36v4, top view.

          Key features

          • Wide 8 V to 50 V operating voltage range
          • High-power: can deliver up to 4 A continuous per phase without extra cooling (6 A max with sufficient additional cooling)
          • Highly configurable through SPI interface
          • Optional STEP/DIR control pins (stepping can also be controlled through SPI interface alone)
          • Nine different step resolutions down to 256 microsteps: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, 1/32-step, 1/64-step, 1/128-step, and 1/256-step
          • Adjustable current control lets you set the maximum current output, enabling the use of voltages above your stepper motor’s rated voltage to achieve higher step rates
          • Adaptive blanking time, adjustable decay times, and various current decay modes enable the creation of ultra-smooth motion profiles through the SPI interface
          • Optional STALL output enables stall detection when microstepping
          • Optional BEMF output enables more advanced control and stall detection algorithms based on the back EMF of the stepper motor
          • Driver supports alternate operating mode for controlling two brushed DC motors with PWM inputs instead of one bipolar stepper motor with STEP/DIR inputs
          • Inputs compatible with 1.8 V, 3.3 V, and 5 V logic
          • Digital outputs are all open drain with pull-ups to externally supplied IOREF voltage for use with non-5V systems (IOREF can be connected to neighboring 5V OUT pin for use with 5V systems)
          • Under-voltage lockout, over-current protection, short circuit protection, and reverse-voltage protection (up to 40 V)
          • Arduino library and example sketches are available that provide basic functions for configuring and operating the driver

          As an alternative to this stepper motor driver, our Tic 36v4 USB Multi-Interface High-Power Stepper Motor Controller has similar power characteristics and offers high-level interfaces (USB, TTL serial, I²C, analog voltage, quadrature encoder, and RC hobby servo pulses) that make it easier to use for some applications. The Tic’s configuration software allows you to change many of the driver’s settings over USB, eliminating the need to directly use SPI to configure the DRV8711.

          19 September 2019 update: We are now shipping a slight revision (md38b) with improved noise and fault tolerance at high input voltages and high current limits.

          Included hardware

          This product ships with all surface-mount components installed as shown in the product picture. However, soldering is required for assembly of the included through-hole parts. The following through-hole parts are included:

          The 0.1″ male headers can be broken or cut into smaller pieces as desired and soldered into the smaller through-holes. These headers are compatible with solderless breadboards, 0.1″ female connectors, and our premium and pre-crimped jumper wires. The terminal blocks can be soldered into the larger holes to allow for convenient temporary connections of unterminated power and motor wires (see our short video on terminal block installation). You can also solder your motor leads and other connections directly to the board for the most compact installation.

          Using the driver

          Pinout

          PINDescription
          VIN8 V to 50 V board power supply connection (reverse-protected up to 40 V).
          VMThis pin gives access to the motor power supply after the reverse-voltage protection MOSFET (see the board schematic at the bottom of this page). It can be used to supply reverse-protected power to other components in the system. This pin can also be used with the adjacent GND pin to add an external electrolytic capacitor in systems where additional bypass capacitance would be helpful.
          GNDGround connection points for the motor power supply and control ground reference. The control source and the motor driver must share a common ground.
          AOUT1Motor output: “positive” end of phase A coil.
          AOUT2Motor output: “negative” end of phase A coil.
          BOUT1Motor output: “positive” end of phase B coil.
          BOUT2Motor output: “negative” end of phase B coil.
          V5 (OUT)Regulated 5 V output: this pin gives access to the voltage from the internal regulator of the DRV8711. The regulator can only provide up to 10 mA, so it is primarily only useful for hard-wiring board inputs high and powering pull-ups for the board’s open-drain outputs. It is generally not intended for powering external devices.
          IOREFAll of the board signal outputs (except BEMF) are open-drain outputs that are pulled up to IOREF, so this pin should be supplied with the logic voltage of the controlling system (e.g. 3.3 V for use in 3.3 V systems). For convenience, it can be connected to the neighboring V5 (OUT) pin when it is being used in a 5 V system.
          STEP/AIN1Changes on this input move the motor current one step up or down in the translator table (even when the motor is disabled). Stepping can also be controlled through the SPI interface, so this pin is optional. In external PWM mode, this pin functions as AIN1 rather than STEP and directly controls the state of the AOUT1 output.
          DIR/AIN2Input that determines the direction of stepper motor rotation. The direction can also be controlled through the SPI interface, so this pin is optional. In external PWM mode, this pin functions as AIN2 rather than DIR and directly controls the state of the AOUT2 output.
          SDATOSPI data output. (This pin is also often referred to as “MISO”.) This pin is an open-drain output and is pulled up to IOREF on the board.
          SDATISPI data input. (This pin is also often referred to as “MOSI”.)
          SCLKSPI clock input.
          SCSSPI chip select input. Logic transitions on this pin are required for SPI communication, even if this is the only device on the SPI bus.
          SLEEPBy default, the driver pulls this pin low, which puts it in a low-power sleep mode where the motor driver circuitry is disabled and all analog circuitry is placed into a low-power state. The digital circuitry still operates in sleep mode, so the device registers can still be accessed via the serial interface. This pin must be driven high to enable the device.
          RESETChip reset input. A logic high on this input resets all internal logic, including the indexer and device registers, and disables the driver outputs. Note: the RESET pin does not function while the device is in sleep mode.
          FAULTOpen-drain output that drives low when an over-current, pre-driver, over-temperature, or under-voltage fault is occurring. This pin is pulled up to IOREF, making it high by default.
          BIN1In external PWM mode, BIN1 directly controls the state of the BOUT1 output. This pin is not used in indexer mode (i.e. when using this device as a stepper motor driver).
          BIN2In external PWM mode, BIN2 directly controls the state of the BOUT2 output. This pin is not used in indexer mode (i.e. when using this device as a stepper motor driver).
          STALL/BEMFVOpen-drain output that is pulled up to IOREF on the board. In internal stall detect mode, output goes low when stall is detected. In external stall detect mode, output goes low when valid back EMF measurement is available.
          BEMFAnalog output that represents the motor back EMF. The signal on this pin can be further processed by a microcontroller to implement more advanced control and stall detection algorithms.

          For more information about these pins, please refer to the DRV8711 datasheet.

          At high input voltages (especially above 30 V) and high current limits, the driver’s SPI interface is more likely to be affected by electrical noise from the driver and stepper motor, potentially leading to communication errors. You can reduce this interference with careful wiring and shielding, and you can lower the risk of unexpected behavior by taking appropriate precautions with SPI communication (for example, read and verify configuration settings after writing them, and avoid configuring the driver while the motor outputs are enabled).

          Alternatively, consider using our Tic 36v4 USB Multi-Interface High-Power Stepper Motor Controller, which provides high-level interfaces for configuration and control (making direct SPI communication unnecessary).

          General typical wiring diagram


          Typical wiring diagram for connecting a microcontroller to a Pololu High-Power Stepper Motor Driver 36v4.


          While the High-Power Stepper Motor Driver 36v4 allows control of a stepper motor through a simple step and direction interface, it must first be enabled and configured through its SPI interface after each power-up. This means that the controlling microcontroller must be capable of acting as an SPI master (either with an SPI peripheral or software SPI), and it must be connected to the SDATI, SCLK, and SCS pins. While the SDATO and FAULT pins are not required to use this driver, it is generally a good practice to use them to monitor for error conditions.

          Typical wiring diagram (5 V systems only)


          Typical wiring diagram for connecting a microcontroller with a logic voltage of 5 V to a Pololu High-Power Stepper Motor Driver 36v4.

          The High-Power Stepper Motor Driver 36v4 has an internal 5 V regulator that can be used to supply IOREF in cases where the board is being used in 5 V systems. We provide a shorting block for connecting V5 to IOREF, or for a more compact connection, you can bridge the surface mount jumper located next to those pins (highlighted in the picture below).
          Surface mount jumper for V5 and IOREF pins on the Pololu High-Power Stepper Motor Driver 36v4.

          Arduino library and example code


          Controlling a Pololu High-Power Stepper Motor Driver 36v4 with an Arduino-compatible #3104 A-Star 32U4 Mini SV.

          We have written a High-Power Stepper Motor Driver library for Arduino that provides basic functions for configuring and operating the driver using an Arduino or Arduino-compatible controller. The library includes several example sketches.

          Power dissipation considerations

          The High-Power Stepper Motor Driver 36v4 can deliver up to 4 A continuous per phase under typical conditions, but the actual current it can deliver will depend on how well you can keep the module cool. The driver’s printed circuit board is designed to draw heat out of the MOSFETs, but performance can be improved by adding a heat sink or forced air flow. (Conversely, performance will be reduced in applications that limit heat dissipation, such as high ambient temperatures or operation in enclosures.) With sufficient additional cooling, the driver can deliver up to 6 A per phase before exceeding the 1 W power ratings of the 30 mΩ current sense resistors.

          The driver’s current limit is set through its SPI interface. You can confirm you have set it correctly by using a multimeter to measure the actual current through one of the coils while the stepper motor is in full step mode and not stepping. The current you measure this way will be approximately 70% of the set limit. 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 switching 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.

          Warning: This motor driver has no meaningful over-temperature shut-off (while the DRV8711 IC has over-temperature protection, it is the external MOSFETs that will overheat first). An over-temperature condition can cause permanent damage to the motor driver. We strongly recommend you do not increase the current limit setting beyond 4 A (or lower in applications with reduced heat dissipation) unless you can first confirm that the temperature of the MOSFETs will stay under 140°C.

          Note: When the driver powers up, the current limit setting defaults to the maximum (~18 A). Make sure you set it to something appropriate for both your stepper motor and the driver before activating the outputs!

          This product can get hot enough to burn you long before the chip overheats. Take care when handling this product and other components connected to it.

          Schematic diagram


          Schematic diagram of the Pololu High-Power Stepper Motor Driver 36v4.

          This diagram is also available as a downloadable pdf (117k pdf).

          Specs

          Dimensions

          Size:1.3″ × 1.2″
          Weight:4.9 g1

          General specifications

          Minimum operating voltage:8 V
          Maximum operating voltage:50 V
          Continuous current per phase:4 A2
          Maximum current per phase:6 A3
          Minimum logic voltage:1.5 V
          Maximum logic voltage:5.5 V
          Microstep resolutions:full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256
          Current limit control:SPI-programmable
          Reverse voltage protection?:Y4
          Header pins soldered?:N

          Identifying markings

          PCB dev codes:md38a, md38b
          Other PCB markings:0J12286, 0J12459

          Notes:

          1
          Without included optional headers or terminal blocks.
          2
          Without a heat sink or forced air flow.
          3
          With sufficient additional cooling. This limitation comes from the 30 mΩ current sense resistors, which are rated for 1 W.
          4
          To -40 V. Connecting supplies over 40 V in reverse can damage the device.

          Resources

          File downloads

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          상호명 (주)위키모바일(로봇사이언스몰) 대표자 김경식
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          1. 주문하신 물품의 총 결제금액이 15만원 이상 (환율의 변동에 따라 다를 수 있음) 이면 과부가세가 발생합니다. 관부가세는 고객님께서 부담하시는 금액으로 문자를 통해 입금내역이 발송되며 해당 관세사로 입금하시면 통관처리됩니다.

          2. 해외구매 특성상 주문에서 배송까지는 평균 10~15일이 소요됩니다. 간혹 현지 제품 수급에 따라 부득이하게 시일이 더 소요 될 수 있으니 구매시 좀 더 여유있게 주문하시길 권합니다.

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          4. 해외배송 특성상 주문접수후 배송상태가 배송준비중으로 넘어간 경우 해외에서 국내로의 배송이 이루어지고 있다는 뜻입니다. 따라서 배송준비중으로 배송상태가 넘어간 경우 취소및 반품이 불가하므로 이점 양해 부탁드립니다.

          5. 타 해외구매대행 사이트에서 주문하신 물건과 주문날짜가 겹치지않도록 주의해 주십시오. 통관날짜가 같을 경우 합산관세가 부가되게 됩니다.
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