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Pololu G2 High-Power Motor Driver 24v21

34,77 €
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Pololu G2 High-Power Motor Driver 24v21

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This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3? × 0.8? board supports a wide 6.5 V to 40 V voltage range and is efficient enough to deliver a continuous 21 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.

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Overview


The Pololu G2 high-power motor driver is a discrete MOSFET H-bridge designed to drive large brushed DC motors. The H-bridge is made up of one N-channel MOSFET per leg; 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 40 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 34 V.

Note: Battery voltages can be much higher than nominal voltages when they are charged, so the maximum nominal battery voltage we recommend is 28 V unless appropriate measures are taken to limit the peak voltage.

The versatility of this driver makes it suitable for a large range of currents and voltages: it can deliver up to 21 A of continuous current with a board size of only 1.3? × 0.8? and no required heat sink. The module offers a simple interface that requires as few as two I/O lines while still allowing for your choice of sign-magnitude or locked-antiphase operation. A current sense output gives an indicator of motor current, and the driver can limit the motor current to a configurable threshold. The power supply inputs feature reverse-voltage protection, while integrated detection of various fault conditions helps protect against other common causes of catastrophic failure; however, please note that the board does not include over-temperature protection.

The G2 High-Power Motor Driver 24v21 is a second-generation successor to our original High-Power Motor Driver 24v20. The G2 driver is much smaller than the original, but its interface and output capabilities make it a near drop-in replacement in typical applications. See “Differences from original high-power motor drivers” below for more details.

Features

  • Operating voltage: 6.5 V to 40 V (absolute maximum)
  • Output current: 21 A continuous
  • Inputs compatible with 1.8 V, 3.3 V, and 5 V logic
  • PWM operation up to 100 kHz
  • Current sense output proportional to motor current (approx. 20 mV/A; only active while H-bridge is driving)
  • Active current limiting (chopping) with default threshold of 50 A (can be adjusted lower)
  • Reverse-voltage protection
  • Undervoltage shutdown
  • Short circuit protection

Pinout


PINDefault StateDescription
VINThis is the main 6.5 V to 40 V (absolute max) motor power supply connection.
VMThis pin gives you access to the motor power supply after reverse-voltage protection. It can be used to supply reverse-protected power to other components in the system, but it should not be used for high currents. This pin should only be used as an output.
+, ?These pads are intended for a power supply capacitor (they are connected to VM and GND, respectively).
3V3 (out)This regulated 3.3 V output provides a few milliamps, which can be useful as a reference or for powering small external circuits. This output should not be connected to other external power supply lines. It is disabled when the driver is in sleep mode. Be careful not to accidentally short this pin to the neighboring VM pin while power is being supplied as doing so will instantly destroy the board!
GNDGround connection for logic and motor power supplies.
OUTAMotor output pin A (connects to one terminal of a DC motor).
OUTBMotor output pin B (connects to the other terminal of a DC motor).
PWMLOWPulse width modulation input: a PWM signal on this pin corresponds to a PWM output on the motor outputs.
DIRLOWDirection input: when DIR is high, current will flow from OUTA to OUTB; when it is low, current will flow from OUTB to OUTA.
SLPHIGHInverted sleep input: This pin is pulled high by the driver board, enabling the driver by default; drive SLP low to put the motor driver into a low-power sleep mode.
FLTFault indicator: This open-drain output is driven low when a fault has occurred. See below for details. In order to use this output, you should externally pull this pin up to your system’s logic voltage.
CSCurrent sense output: This pin outputs a voltage proportional to the motor current when the H-bridge is driving (but not while it is braking, including when current limiting is active). The output voltage is about 20 mV/A plus a 50 mV offset.
VREFReference voltage input: An additional resistor can be connected between this pin and GND to lower the current limiting (chopping) threshold. Without an additional resistor, the current limit defaults to about 50 A. See below for details.

Dimensions

Size:1.3? × 0.8?
Weight:5.0 g1

General specifications

Motor channels:1
Minimum operating voltage:6.5 V
Maximum operating voltage:40 V2
Continuous output current per channel:21 A3
Current sense:0.02 V/A
Maximum PWM frequency:100 kHz
Minimum logic voltage:1.8 V
Maximum logic voltage:5.5 V
Reverse voltage protection?:Y

Identifying markings

PCB dev codes:md31b
Other PCB markings:0J9488

Notes:

1
Without included connectors or additional through-hole capacitors.
2
Absolute maximum; higher voltages can permanently destroy the motor driver. Recommended maximum is approximately 34 V, which leaves a safety margin for ripple voltage on the supply line.
3
Typical results with 100% duty cycle at room temperature.

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PO-2995