Product category: Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3932
Edited by the Electronicstalk Editorial Team on 1 June 2001
Three-phase brushless DC
motor MOSFET controller
The new A3932 from Allegro MicroSystems is a three-phase brushless DC motor controller integrated circuit
The device features a high-current gate-drive capability of 1.25A for gate turn-on and 2.5A for gate turn-off. As a result, it can drive a wide range of power mosfets, and can support motor supply voltages from 12 to 50V. The A3932 integrates a bootstrapped high-side driver to minimise the external component count required to drive N-channel mosfet drivers.
Related stories
Regulators power satellite receivers
Voltage regulator ICs are designed for use in the low noise block sections of analogue and digital satellite receivers
Paper on high-speed low-noise current sensing
Innovative developments in high-speed low-noise current sensing will be presented in a paper given at the PCIM Conference, taking place in Nuremberg between 22nd and 24th May
Internal fixed off-time pulsewidth-modulated (PWM) current control circuitry can be used to regulate the maximum load current to a desired value.
The peak load current limit is set by the user's selection of an input reference voltage and external sensing resistor.
In addition to speed and direction control functions, the circuit features a brake input, a fault diagnostic output, and a tachometer output.
Further reading
Hall switch has a finger on the pulse
General-purpose Hall-effect bipolar switch is optimised for applications where pulsing the supply line is used to conserve power
Fast and slow current decay modes can be implemented.
The fixed off-time pulse duration is set by a user-selected external RC timing network.
For added flexibility, the PWM input can be used to provide speed/torque control, allowing the internal current control circuit to set a maximum current limit.
The A3932 includes optional synchronous rectification.
This feature will short out the current path through the power mosfet's intrinsic body diodes during PWM off-cycle current decay.
This can minimise power dissipation in the mosfets, eliminate the need for external power clamp diodes, and potentially allow a more economical choice for the mosfet drivers.
The new circuit provides commutation logic for Hall sensors configured for 120-degree spacing.
The Hall input pins are pulled up to an internally generated 5V reference.
Power mosfet protection features include a gate-source voltage monitor, a bootstrap capacitor charging-current monitor, undervoltage monitoring, motor-lead short to supply or ground protection, and thermal shutdown.
The A3932 is supplied in a 32-pin PLCC package.
• Allegro MicroSystems Europe: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Related Business News
Applications/Solutions
High-performance analog ICs provide efficient, compact and dependable solutions for engine management systems, body electronics and comfort systems.
Taiwan Shares Climb 0.9 Percent
Taiwan shares rose on Thursday as investors were cheered by U.S. stock gains overnight. The Weighted Price Index of the Taiwan Stock Exchange rose 49.39 points, or 0.9 percent, to close at 8061.28.
Acxiom Agrees to Be Acquired by...
...Silver Lake and ValueAct Capital for $3.0 Billion. Acxiom Corporation announced today that it has entered into a definitive agreement to be acquired by Silver Lake, the leading investment firm focused on large-scale investments in technology-driven growth industries, and ValueAct
Opnext Reports Fourth Quarter and Full Year Operating Results
Opnext, Inc. , a global leader in the design and manufacturing of optical modules and components, today announced preliminary and unaudited financial results for the fourth quarter and full year ended March 31, 2007.
Vista Partners Updates Coverage on TXP...
...Corporation; Maintains $0.80 Price Target. Vista Partners announced today that it has update coverage on TXP Corporation . Vista Partners provides equity research to institutional and individual investors, with a focus on publicly traded small capitalization companies.
Search the Pro-Talk network of sites
