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Description: The Pololu 15 Amp high-power motor driver is a discrete MOSFET H-bridge designed to drive one DC brushed motor. The H-bridge is made up of one N-channel MOSFET per leg, and most of the board’s performance is determined by these MOSFETs (the rest of the board contains the circuitry to take user inputs and control the MOSFETs). The board supports a wide 5.5 to 24 V voltage range and is efficient enough to deliver a continuous 15 A without a heat sink, or 21 A with a heat sink.

With the PWM pin held low, both motor outputs will be held low (a brake operation). With PWM high, the motor outputs will be driven according to the DIR input. This allows two modes of operation: sign-magnitude, in which the PWM duty cycle controls the speed of the motor and DIR controls the direction, and locked-antiphase, in which a pulse-width-modulated signal is applied to the DIR pin with PWM held high.

The included axial capacitor should be mounted to the + and - holes in the middle of the PCB. Make sure the cap is connected with the correct orientation. 

Note: Batteries that are nominally 24 V can be much higher than that when fully charged; this product is therefore not recommended for use with 24 V batteries unless appropriate measures are taken to limit the peak voltage.

Features:

  • IRF7862PBF MOSFETs Motor Driver
  • 1 Motor Channel
  • Operating Voltage: 5.5 - 24V
  • Continuous output current: 15 Amps
  • Peak output current: 170 Amps
  • Max PWM frequency: 40kHz
  • MOSFET on-resistance: 3.7mOhm

Dimensions: 1.3" x 0.8"

Documents:

Comments 33 comments

  • I agree with jepler. I would have been nice to know what the 28-pin IC is. If it is the Allegro A3941 then it will have up to 14 mA quiesent current draw.

    • Yep, the chip label is actually scratched out, the pictures are not edited. So your guess is as good as ours at to what the chip actually is.

    • While I can’t rule out that it’s another similar chip, the location of the charge pump caps and the FF1/FF2/Reset lines make it seem a likely candidate to me.
      I was interested in this question not because of the quiescent current, but because I wondered what part is the reason for the voltage limit. The IRF power MOSFETs are good to 30Vds. So did they skimp on the caps (25V parts)? or conservatively derate the MOSFETs? Inquiring minds want to know!

      • The MOSFETs have an absolute maximum voltage rating of 30 V, and higher voltages can permanently destroy the motor driver. Under normal operating conditions, ripple voltage on the supply line can raise the maximum voltage to more than the average or intended voltage, so a safe maximum voltage is approximately 24 V. The absolute maximum operating voltage for the board is 30 V.

  • Too bad the 28-pin IC’s part number is blocked out. Based on function and layout, it must be something like Allegro A3941 (a 50V-capable part).

  • Hello All, where can i find schema and eagle files for this product ?

    • Yes, I, too, would like to see the schematic of this. Pololu doesn’t make their schematics very public. Anyone find one on this?

    • Check the Pololu link above. They manufacture this board so the files should be there.

  • Question!

    I want to control 4 DC brush motors, I don’t need them to run at the same time… Ever, but I do need to be able to control the speed of each one, when one is on. SO…

    To save money, can I just run the output of this controller and split to 4 individual N channel mosfets, each mosfet will control one of the dc brush motors, then use 4 arduino pins to turn each individual motor on and off?

  • Is there a way to smooth the pwm on the output going to the motor? I’m using the pwm to slow my motor, and would like to cut down the motor noise. I tried putting a capacitor on the pwm that controls the MOSFETS, but that made it difficult to control the speed.

  • The description states that this is “designed to drive one DC brushed motor.” Will it work on brushless?

    I know that is a newbie question, but I am what I am… and what I am is trying to find something to drive a 12V 7.5A diaphragm pump which, according to the spec sheet, is using a brushless motor and I am wondering if this will work.

    • Brushless motors have three phases that need to be controlled properly in order to get them to spin, and each of those three phases needs half of an H-bridge to drive it. This board has two half-bridges, so you’re short one. You may be able to make it work with two of these boards, however, you’d still be left with a lot of work to actually drive the boards in the proper sequence from an external microcontroller, and for a newbie that might be more than you want to bite off (or it might not, if you’re ambitious, by all means go for it!)

      SFE doesn’t currently carry anything that makes this particularly easy, but depending on your budget you might look at purpose-built brushless-motor driver boards from others. There are a number of these available for the radio control market (typically called ESC for Electronic Speed Controller), as well as brushless-motor driver boards of all sizes for the robotics market. Good luck!

  • It seems that this driver can be used to control a TEC, specifically the 15V 7A sold by sparkfun. Other controllers seem to be underpowered. Am I right about that?

  • Hi… i bought two of Motor Driver 15A IRF7862PBF from india.one is working fine but the other motor driver is not working properly even the connections and data are given correctly.But my observation with not working Motor driver is even when the V+ and Gnd of motor power is not connected with the power,the voltage between +V and Gnd is 4.00 V and voltage between Gnd and Motor OUT A is 1.01 V and the same is with Motor OUT B existing.This is not in the case of working one.What can be a problem with my second motor driver?

  • I can feed this circuit with a battery of 12V/700mA and obtain in the out of driver 15A that says datasheet? the circuit can generate this current output without the power supply gives that current?

  • Has anyone used this? Does it work fine?
    Thank you!

    • This motor driver was released more than 2.5 years ago, so I think someone has probably used it by now ;) And yes, it does actually function as specified in the product description. A more detailed description and usage instructions are available on Pololu’s page for this product.

      • Thanks Ben. Well I am making a DC servo motor controller circuit. The encoder signals have been taken care of but driving the motor has become a problem with the ordinary ICs like L293, L298, LMD18200, etc. as the motor ratings are 60W, 24V, 3.7A, 3000 rpm. Is there any better motor driver than this one for the my motor? Help buddy!

        • I would not recommend powering this motor driver from a 24 V battery. If you want something that will work in a 24 V system, Pololu carries higher-voltage versions of this driver and motor controllers with similar power outputs and higher-level interfaces (see the Simple Motor Controllers).
          If your goal is to make a servo, have you considered the jrk 21v3 motor controller with feedback? If your servo uses analog voltage feedback, it sounds like that might be perfect for you.

  • Can 4 of this drivers be handled by the IOIO Board over PWM and seperated Power Supply ?
    If so, is it enough connecting a PWM OUT from the IOIO to an PWM IN on the Driver Board ?
    Thanks in advance!

  • According to the data sheet, shown by jthendean, the motor driver will push supply 21A continuously if you can affix a heat sink to it. Has anyone had luck with this? I’m designing an enclosure for it and I’d like to heat sink it, but give the assembly as shown I wasn’t sure if I should affix the heat sink to the bottom or the top of the board. Thoughts?

    • Affixing it to the bottom risks shorting together different nodes if you’re not very careful. I think you should put the heat sink along the tops of the four MOSFET packages as those are what you are ultimately trying to keep from overheating.

  • I connected PWM and DIR to Arduino. I connected the two wires from the motor to OUTA and OUTB, 12v. to V+ on the motor power side and I grounded it. I also supplied 5V to the V+ on the logic pin side and grounded it as well. I connected PWM pin from the motor driver to the PWM pin on Arduino and the DIR pin (motor driver) to a non PWM digital pin. I programed it so that it changes directions every 2 seconds.
    When I turn on the 12V power supply, the power for arduino comes on as well. The motor does not turn until I plug in the USB cable for Arduino. It rotates in the speed that I expect for 2 seconds and then it starts to vibrate. The power light is dim with just with the power supply and when I plug the USB cable, it becomes brighter. If the USB is already plugged and if I plug the 12v power supply, the motor turns extremely slowly and it vibrates as well.
    What am I doing wrong?
    I would really appreciate a response.
    Thanks.

    • This is of course late, but for future reference, I believe that you shouldn’t hook up the logic side’s V+ to a 5V power. According to pololu ‘V+ pad on the logic side of the board gives you access to monitor the motor’s power supply’. Also since they mention the 5V line being able to supply a regulated 5V, my assumption is that the chip has a built in regulator that takes the Vin and supplies 5V to all the logic components. My reference is pololu’s website for this product: http://www.pololu.com/catalog/product/755

    • I have some ideas as to what might be happening, but I’d rather not start a long thread on the comments. Could you email us at techsupport@sparkfun.com?

  • Try the following link for board description and operation:
    http://www.pololu.com/catalog/product/755

  • Looks like the A3941 MOSFET driver. The FF1 and FF2 error outputs are the same as are the DIR and PWM style inputs. Plus pins 7-8, 13-14 and 17-18 are tied on the 3941.

  • Do you have a link to a datasheet for the board, not just for the FET?

  • datasheet link is busted and description reads like it can both control more than one motor, but also specifically says it can control only one motor, which is confusing.


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