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 absolute maximum voltage for this motor driver is 50 V. 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 44 V.
The versatility of this driver makes it suitable for a large range of currents and voltages: it can deliver up to 20 A of continuous current with a board size of only 1.8" by 1.2" and no required heat sink. With the addition of a heat sink, it can drive a motor with up to 20 A of continuous current.
This board also features a current-sensing circuit that measures bidirectional motor current with a magnitude up to 30 A and outputs an analog voltage.
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.
- Motor Channel: 1
- Minimum Operating Voltage: 5.5V
- Maximum Operating Voltage: 50V
- Continuous Output Current Per Channel: 20A
- Current Sense: 0.066V/A (Bidirectional centered at 2.5 V with VCS of 5 V)
- Peak Output Current Per Channel: 200A
- Maximum PWM Frequency: 40KHz
- Maximum Logic Voltage: 5.5V
- Reverse Voltage Protection? : No
- User's Guide at Pololu's website
Dimensions: 1.8" x 1.2"