Pololu High-Power Motor Driver 18v15
 

This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor.
The little 1.3×0.8-inch board supports a wide 5.5 to 30 V voltage range and is
efficient enough to deliver a continuous 15 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 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 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.
 

The versatility of this driver makes it suitable for a large range of currents and voltages:
it can deliver up to 15 A of continuous current with a board size of only 1.3" by 0.8" and no required heat sink. With the addition
of a heat sink, it can drive a motor with up to about 21 A of continuous current.
The module offers a simple interface that requires as little as
two I/O lines while allowing for both sign-magnitude and locked-antiphase operation.
Integrated detection of various short-circuit conditions protects against common
causes of catastrophic failure; however, please note that the board does not include reverse power
protection or any over-current or over-temperature protection.
 

Using the Motor Driver

Connections

The motor and motor power connections are on one side of the board, and the control connections
(5V logic) are on the other side. The motor supply should be capable of supplying high current,
and a large capacitor should be installed close to the motor driver.
The included axial capacitor can be installed directly on the board in the pins
labeled '+' and '-' as shown below. Such installations are compact but might limit heat sinking options;
also, depending on the power supply quality and motor characteristics, a larger capacitor might be required.
There are two options for connecting to the high-power signals (V+, OUTA, OUTB, GND):
large holes on 0.2" centers, which are compatible with the included terminal blocks,
and pairs of 0.1"-spaced holes that can be used with perfboards, breadboards, and 0.1" connectors.
 

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