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.
Dimensions: 1.3" x 0.8"
Based on 2 ratings:
I’m using this controller to drive a thermoelectric cooler module rated at 5A at 12 V. I’m cooling or heating a small laser diode module from 0 to 50C. Since the thermal mass is low, I usually only use 6V for the supply. As a result, module that can handle 15A air 24V is quite a bit of overkill. On the other hand, I don’t have to worry about overheating the driver module—as I have done with some robotics projects in the past.
One small annoyance has shown up–I have to be careful about power sequencing at startup. I think the module wants stable low PWM and direction inputs at startup, so i have to make sure to turn on its power supply before I start the micro controller providing the PWM and DIR inputs.
I did find out that thermoelectric modules don’t like pure PWM inputs—they lose a LOT of efficiency. Because of this, I had to add a filter section with 47uH inductors and 100uF capacitors between the motor driver and the thermoelectric cooler module.
Works as advertised even pushing past 15A does not get hot.