Motor driver

March 20, 2013
The A3918 is a full-bridge dc-motor driver capable of 1-A continuous
output and 2.5 to 9-V operating voltage

The A3918 is a full-bridge dc-motor driver capable of 1-A continuous output and 2.5 to 9-V operating voltage. An internal PWM current reference lets users select the peak chop current with a resistor only. The single supply and simple logic interface makes the driver suitable for single-cell Li-ion applications.

The driver uses a two-stage charge pump to ensure it has a low RDS (on) over the entire supply range from 9 down to 2.5 V. This dramatically improves battery life when voltages are low because switches do not become highly resistive due to reduced gate drive, resulting in more energy for the load and less heating and power dissipation in bridge. For overcurrent or locked rotor, an internal fixed off-time PWM timer sets a peak current with the addition of a current sense resistor. An overcurrent output flag notifies users when the current in the motor winding reaches the peak current.

Allegro MicroSystems
115 Northeast Cutoff
Worcester, MA 01606
(508) 853- 5000
www.allegromicro.com

© 2013 Penton Media, Inc.

Sponsored Recommendations

Sept. 16, 2025
From robotic arms to high-speed conveyors, accuracy matters. Discover how encoders transform motor control by turning motion into real-time datadelivering tighter speed control...
Sept. 16, 2025
Keep high-torque gearboxes running efficiently with external lubrication and cooling systems delivered fast. Flexible configurations, sensor-ready monitoring, and stocked options...
Sept. 16, 2025
Now assembled in the U.S., compact P2.e planetary gear units combine maximum torque, thermal efficiency, and flexible configurations for heavy-duty applicationsavailable faster...
Sept. 16, 2025
Safety in automation goes beyond fences and emergency stops. Learn how functional safety actively monitors and controls motiondelivering smarter protection, greater flexibility...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!