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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.)
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.
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:
PIN | Description |
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VIN | 8 V to 50 V board power supply connection (reverse-protected up to 40 V). |
VM | This 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. |
GND | Ground connection points for the motor power supply and control ground reference. The control source and the motor driver must share a common ground. |
AOUT1 | Motor output: “positive” end of phase A coil. |
AOUT2 | Motor output: “negative” end of phase A coil. |
BOUT1 | Motor output: “positive” end of phase B coil. |
BOUT2 | Motor 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. |
IOREF | All 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/AIN1 | Changes 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/AIN2 | Input 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. |
SDATO | SPI 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. |
SDATI | SPI data input. (This pin is also often referred to as “MOSI”.) |
SCLK | SPI clock input. |
SCS | SPI chip select input. Logic transitions on this pin are required for SPI communication, even if this is the only device on the SPI bus. |
SLEEP | By 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. |
RESET | Chip 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. |
FAULT | Open-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. |
BIN1 | In 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). |
BIN2 | In 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/BEMFV | Open-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. |
BEMF | Analog 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).
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.
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.
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.
Specs
Size: | 1.3″ × 1.2″ |
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Weight: | 4.9 g1 |
Minimum operating voltage: | 8 V |
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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 |
PCB dev codes: | md38a, md38b |
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Other PCB markings: | 0J12286, 0J12459 |
Resources
b. 해외상품 :
1) 해당상품: 아이콘이 부착된 상품
2) 구매금액 700,000원 이상 : 입금확인 후 최소 5일 ~ 최대 2주
3) 구매금액 700,000원 이하 : 입금확인 후 최소 1주 ~ 최대 8주
4) 단, 해외계약업체에 품절되지 않은 상품에 한함
② 구매상품 종류가 많을 경우 예상 준비기간 보다 더 소요 될 수 있습니다.
③ 주문하신 상품은 출고완료 메일 또는 문자 수신 후 익일~최대7일(도서,산간지역)
이내에 수령하실 수 있습니다.
④ 제주(\3,500원)/도서지역(\5,000원)은 배송비가 추가됩니다.
제주,도서, 산간지역은 타 지역보다 배송기간이 길어질 수 있습니다.
⑤ 아이콘이 부착된 상품이라도 국내재고가 있을 수 있습니다.
⑥ 해외 현지 사정으로 인해 공지한 배송기간보다 더 길어 질 수 있습니다.
⑦ 해외상품은 반품/교환/취소가 어려울 수 있으니 신중히 주문하시기 바랍니다.
3. 소비자의 단순변심/착오구매에 의한 청약철회제한안내
① 전자상거래 등에서의 소비자보호에 관한 법률 제17조 제2항 및 동 시행령
제21조에 의한 청약철회 제한 사유에 해당하는 경우 및 기타 객관적으로
이에 준하는 것으로 인정되는 경우에 한합니다.
② 소비자의 단순변심, 착오구매에 의한 교환/반품 시에 발생하는 배송비는
소비자가 부담합니다.
③ 판매자의 실수,제품하자 등의 사유로 인한 배송비는 판매자가 부담합니다.
4. 상품의 교환/반품/보증조건 및 품질보증기준안내
① 상품이 공급된 날(배송완료일)로부터 7일 이내에 교환/반품을 신청 할 수 있습니다.
그러나 아래의 사유에 해당 하는 경우에는 교환/반품 신청이 받아들여지지 않을 수도 있습니다.
a. 소비자의 책임으로 인해 상품이 훼손/멸실 된 경우(확인을 위한 포장훼손제외)
b. 소비자의 사용에 의해 상품의 가치가 현저하게 감소한 경우
c. 시간의 경과로 인해 상품의 재판매가 불가하게 된 경우
d. 판매방식의 특성으로 판매자에게 회복할 수 없는 피해가 발생한 경우 (주문제작 상품, 청약철회상품 등)
② 교환/반품/보증조건 및 품질보증기준은 『소비자기본법』에 따른 소비자분쟁해결기준에 따라 피해를 보상합니다.
5. 소비자피해보상 처리, 재화 등에 대한 불만 및 분쟁처리 안내
판매자 | 본사 | 셀러등급 | |
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상호명 | (주)위키모바일(로봇사이언스몰) | 대표자 | 김경식 |
사업자등록번호 | 215-87-14086 | 통신판매신고번호 | 제2008-서울송파-0867호 |
연락처 | 02-2283-1300 | 사업장 소재지 | 서울특별시 송파구 문정동 643-1 엠스테이트 B동704호 |
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회사명 : (주)위키모바일(로봇사이언스몰)
| 사업자등록번호 : 215-87-14086 [사업자정보확인]
| 주소 : 서울특별시 송파구 법원로 114 엠스테이트 B동704호 통신판매업 신고 : 제2008-서울송파-0867호 | 연락처 : 02-2283-1300 | FAX : 02-2283-1304 | 개인정보보호 책임자 : 김 경식 | 대표자 : 김경식 호스팅사업자 : 가비아 퍼스트몰 | contact : ask@wikimobile.co.kr for more information *로봇사이언스몰의 콘텐츠 저작권은 (주)위키모바일에 있으며 무단·전재·복사 배포를 금합니다. |
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