The 758-POLOLU is a discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor.
The little 1.8×0.8-inch board supports a wide 5.5 to 30 V voltage range and is efficient enough to deliver a continuous 25 A without a heat sink.
The Pololu high-power motor driver is a discrete MOSFET H-bridge designed to drive large DC brushed motors. The H-bridge is made up of two 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 MOSFET datasheet is available under the “Resources” tab. 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.
Pinout
| PIN | Default State | Description |
|---|---|---|
| V+ | This is the main 5.5 – 30 V motor power supply connection, which should typically be made to the larger V+ pad. The smaller V+ pads along the long side of the board are intended for power supply capacitors, and the smaller V+ pad on the logic side of the board gives you access to monitor the motor’s power supply (it should not be used for high current). | |
| 5V (out) | This regulated 5V output provides a few milliamps. This output should not be connected to other external power supply lines. Be careful not to accidentally short this pin to the neighboring V+ pin while power is being supplied as doing so will instantly destroy the board! | |
| GND | Ground connection for logic and motor power supplies. | |
| OUTA | A motor output pin. | |
| OUTB | B motor output pin. | |
| PWM | LOW | Pulse width modulation input: a PWM signal on this pin corresponds to a PWM output on the motor outputs. |
| DIR | FLOAT | Direction input: when DIR is high current will flow from OUTA to OUTB, when it is low current will flow from OUTB to OUTA. |
| RESET | HIGH | The reset pin, when pulled low, puts the board into a low-power sleep mode and clears any latched fault flags. |
| FF1 | LOW | Fault flag 1 indicator: FF1 goes high when certain faults have occurred. More details from Pololu.com. |
| FF2 | LOW | Fault flag 2 indicator: FF2 goes high when certain faults have occurred. More details from Pololu.com. |
WARNING
