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Associated Equipment for Measurement and Quality Testing
News Release from: Allegro MicroSystems Europe | Subject: A3938 Motor controller
Edited by the Manufacturingtalk Editorial
Team on 19 December 2003
High-Current Gate Driver IC For 3-Phase
Motors
Allegro MicroSystems has introduced a new 3-phase motor controller IC with high-current gate-drive capability, the A3938 drives a wide range of power discrete n-channel MOSFETs.
Allegro MicroSystems has introduced a new 3-phase motor controller IC with high-current gate-drive capability The new A3938 drives a wide range of power discrete n-channel MOSFETs and supports motor supply voltages from 12 V to 50 V
This article was originally published on Manufacturingtalk on 16 Dec 2003 at 8.00am (UK)
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The A3938 integrates a bootstrapped high-side driver to minimise the external component count required to drive the n-channel MOSFETs.
Integrated pulse-width-modulation (PWM) control logic, commutation logic, synchronous rectification and sophisticated protection features make the A3938 cost-effective and easy to implement.
The new controller also offers selectable coast or dynamic braking options, allowing the end user to carry out controlled motor operation during a power-loss event.
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Internal fixed off-time PWM current control circuitry can be used to regulate the maximum load current to a desired value for speed/torque control.
For added flexibility, a user-selected external RC timing network sets the fixed off-time pulse duration.
In addition, the A3938 features an adjustable crossover delay for cross-conduction protection.
The A3938 synchronous rectification circuitry minimises the power dissipation in the discrete MOSFETs, eliminating the need for external power clamp diodes and allowing for a more economical choice for the n-channel MOSFET drivers.
The device includes commutation logic for directly interfacing Hall sensors configured for 120deg spacing.
The Hall input pins are pulled up to an internally generated 5 V reference.
Power MOSFET protection features include a bootstrap capacitor charging current monitor, an under-voltage monitor, motor-lead short-to-ground protection, and thermal shutdown.
The A3938 is manufactured using Allegro's new ABCD3 (Allegro Bipolar/CMOS/DMOS third-generation) process, and is targeted to meet the needs of the office automation, industrial, consumer and medical equipment markets.
The A3938 is offered in 32-lead PLCC, 36-lead QSOP, or 38-lead TSSOP packages.
About Allegro MicroSystems Allegro MicroSystems, a wholly-owned American-managed subsidiary of Sanken Electric Co., Ltd., is a leading supplier of advanced mixed-signal semiconductor integrated circuits, including Hall-effect sensors, motor-driver ICs, power-conversion devices, power-interface ICs, and power-management ICs.
Allegro provides innovative system-level solutions that primarily serve the automotive, industrial, consumer, and computer peripheral markets.
With over 2500 employees, Allegro is headquartered in Worcester, MA, USA, and operates multiple wafer-fabrication plants worldwide.
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