Full-bridge DC motor driver

November 2005
Portable Design;Nov2005, Vol. 11 Issue 11, p44
The article describe Allegro MicroSystems' A1441 full-bridge motor driver, designed to drive single-phase, low-voltage, bipolar brushless direct current motors. Commutation of the motor is achieved by the use of a single Hall element to detect the position of an alternating pole ring magnet. An on-chip charge pump circuit allows for the use of a MOS full-bridge output complete with body diodes, eliminating the need for flyback diodes or capacitors. All necessary circuitry is integrated and no external devices are required. A bypass capacitor is recommended to lower switching transients for reduced radiated emissions.


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