Product category:
Motors and Variable speed drives
News Release from: Allegro MicroSystems Europe | Subject: A1441
Edited by the Processingtalk Editorial
Team on 21 February 2006
IC integrates Hall element and motor
control
The new A1441 from Allegro MicroSystems Europe is a full-bridge motor driver integrated circuit designed to drive single-phase, low-voltage bipolar brushless DC motors
The new A1441 from Allegro MicroSystems Europe is a full-bridge motor driver integrated circuit designed to drive single-phase, low-voltage bipolar brushless DC motors Commutation of the motor is achieved by the use of a single Hall-effect sensing element which detects the position of an alternating pole ring magnet
This article was originally published on Processingtalk on 2 Feb 2004 at 8.00am (UK)
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The Allegro advanced IC semiconductor process allows the integration of the Hall element on the same IC as the motor control circuitry, providing a single-chip solution for high reliability.
The A1441 is optimised for use with the vibration motors - including the thinner coin-type motor designs - that are typically used in portable electronic devices such as mobile phones, pagers, and hand-held video game controllers.
It is also suited to use in gaming machines, where brushless motors are increasingly being used for higher reliability, as well as for driving low-end fan motors that do not require currents above 150 mA.
All necessary circuitry is integrated and no external devices are required - although a bypass capacitor is recommended to lower switching transients and therefore reduced radiated emissions.
The switch-points of the device are chopper-stabilised for precision over a range of operating temperatures and voltages, providing highly accurate and repeatable commutation.
The device will operate at voltages down to 2.0 V, and the full H-bridge output provides higher torque at start-up.
An active braking function and 'sleep' mode can be enabled by an external signal.
The active braking function allows for a quick stop in order to improve stop/start cycles in applications such as gaming machines.
The micro-power sleep mode reduces current consumption to near zero current for battery management in portable applications.
The device is available in a low-profile 2 x 2 x 0.5 mm MLP package with 100% tin plating (EL package).
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