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[로봇사이언스몰][Pololu][폴로루] DRV8838 Single Brushed DC Motor Driver Carrier #2990
This tiny breakout board for TI’s DRV8838 motor driver can deliver a continuous 1.7 A (1.8 A peak) to a single brushed DC motor. With an operating voltage range from 0 V to 11 V and built-in protection against reverse-voltage, under-voltage, over-current, and over-temperature, this driver is a great solution for powering a small, low-voltage motor. The carrier board has the form factor of a 10-pin DIP package, which makes it easy to use with standard solderless breadboards and 0.1″ perfboards.
Overview
This motor driver is essentially a smaller, lower-cost, single-channel alternative to our DRV8835 dual motor driver carrier and DRV8833 dual motor driver carrier, which have very similar operating voltage ranges and current ratings but offer an additional motor channel.
For higher-voltage alternatives to this driver, please consider our MAX14870, A4990, and DRV8801 motor driver carriers.
Two 1×5-pin breakaway 0.1″ male headers are included with the DRV8838 motor driver carrier, which can be soldered in to use the driver with breadboards, perfboards, or 0.1″ female connectors. (The headers might ship as a single 1×10 piece that can be broken in half.) The right picture above shows the two possible board orientations when used with these header pins (parts visible or silkscreen visible). You can also solder your motor leads and other connections directly to the board.
Motor and motor power connections are made on one side of the board and logic power and control connections are made on the other. The driver requires a motor voltage between 0 V and 11 V to be supplied to the VIN or VM pin and a logic voltage between 1.8 V and 7 V to be supplied to the VCC pin; the logic voltage can typically be supplied by or shared with the controlling device. The VIN pin is the reverse-protected motor supply input and is the recommended point for connecting motor power. However, driver performance will start getting worse when the input voltage to the reverse-protection circuit is below a few volts, and 1.5 V is the lower limit of where the VIN pin can be used. For very low voltage applications, the motor supply should be connected directly to VM, which bypasses the reverse-protection circuit.
The DRV8838 offers a simple two-pin PHASE/ENABLE control interface, where the PHASE pin determines the motor direction and the ENABLE pin can be supplied with a PWM signal to control the motor speed. The PHASE and ENABLE control inputs are pulled low through weak internal pull-down resistors (approximately 100 kΩ). When the ENABLE pin is low, the motor outputs are both shorted to ground, which results in dynamic braking of a connected motor.
The SLEEP pin can be driven low to put the driver into a low-power sleep mode and turn off the motor outputs, which is useful if you want to let the motor coast. The SLEEP pin is pulled high through a 10 kΩ pull-up resistor on the carrier board so that the driver is awake by default; the quiescent current draw of the board will be dominated by the current through this resistor when the pin is driven low to put the driver to sleep. In most applications, this pin can be left disconnected or can serve primarily as a way to enable coasting. For applications where a low-power sleep mode is desirable, the 10 kΩ pull-up resistor can be removed or the logic voltage (VCC) for the driver can be dynamically supplied by a digital output of your microcontroller.
The following simplified truth table shows how the driver operates:
PHASE | ENABLE | SLEEP | OUT1 | OUT2 | operating mode |
---|---|---|---|---|---|
0 | PWM | 1 | PWM | L | forward/brake at speed PWM % |
1 | PWM | 1 | L | PWM | reverse/brake at speed PWM % |
X | 0 | 1 | L | L | brake low (outputs shorted to ground) |
X | X | 0 | Z | Z | coast (outputs floating/disconnected) |
PIN | Default State | Description |
---|---|---|
VIN | Reverse-protected motor power supply input. While the driver can operate from a motor supply of 0 V to 11 V, the reverse-protection circuit will start negatively affecting performance below a few volts, and 1.5 V is the lower limit of where it can be used. Power can be supplied directly to VM to bypass the reverse-protection circuit. | |
VCC | 1.8 V to 7 V logic power supply connection. Logic supply current draw is typically only a few milliamps at most, so in many applications this pin can optionally be dynamically powered by a microcontroller digital output. | |
VM | This pin gives access to the motor power supply after the reverse-voltage protection MOSFET (see the board schematic below). It can be used to supply reverse-protected power to other components in the system. It is generally intended as an output, but it can also be used to supply board power (such as in cases where the motor supply voltage is too low for the reverse-protection circuit). | |
GND | Ground connection points for the motor and logic power supplies. The control source and the motor driver must share a common ground. | |
OUT1 | H-bridge output 1. | |
OUT2 | H-bridge output 2. | |
PHASE | LOW | Direction control input. |
ENABLE | LOW | Speed control input; logic high causes the motor to drive. |
SLEEP | HIGH | Sleep/coast mode input; logic high results in normal operation. |
The DRV8838 datasheet recommends a maximum continuous current of 1.8 A. However, the chip by itself will typically overheat at lower currents. In our tests, we found that for most combinations of logic (VCC) and motor supply (VIN) voltages, the chip was able to deliver 1.8 A for between 30 seconds and a few minutes before the chip’s thermal protection kicked in and disabled the motor outputs; a continuous current of 1.7 A was sustainable for many minutes without triggering a thermal shutdown.
When both the motor and logic voltages are low (on order of a few volts), the driver will start overheating sooner and the maximum achievable output current will be reduced. For example, in our tests with VIN and VCC at 2 V, the maximum continuous output current of the driver dropped to around 1.4 A, and drawing 1.8 A from the chip caused it to overheat in a few seconds.
The actual current you can deliver will depend on how well you can keep the motor driver cool. The carrier’s printed circuit board is designed to help with this by drawing heat out of the motor driver chip. Our tests were conducted at 100% duty cycle with no forced air flow; PWMing the motor will introduce additional heating proportional to the frequency.
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.
Size: | 0.4″ × 0.5″1 |
---|---|
Weight: | 0.3 g1 |
Motor driver: | DRV8838 |
---|---|
Motor channels: | 1 |
Minimum operating voltage: | 0 V |
Maximum operating voltage: | 11 V |
Continuous output current per channel: | 1.7 A2 |
Peak output current per channel: | 1.8 A |
Maximum PWM frequency: | 250 kHz |
Minimum logic voltage: | 1.8 V |
Maximum logic voltage: | 7 V |
Reverse voltage protection?: | Y |
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 | |
---|---|---|---|
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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