Allegro MicroSystems Europe Ltd

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Allegro MicroSystems Europe Ltd Articles

Displaying 221 - 240 of 250
29th November 2007
Low-voltage voice-coil motor driver IC with I2C interface

The new A3904 from Allegro MicroSystems Europe is said to be the first in a series of voice-coil motor driver ICs designed for camera auto-focus and zoom applications. Featuring a built-in I2C serial interface for precise high-speed digital programming with only two control lines, the new device features an operating voltage range of 2.4 to 5.5 V and a maximum output current of 127 mA. Output current is programmed via the I2C interface in 500 µA...

19th November 2007
Flyback convertor for driving vacuum fluorescent displays

The new A4401 from Allegro MicroSystems Europe is an automotive-grade quasi-resonant discontinuous flyback convertor control IC which provides all the necessary control functions for driving a vacuum fluorescent display (VFD) with the minimum of external components.

2nd November 2007
Three-phase brushless DC motor pre-driver IC from Allegro

The new A4931 from Allegro MicroSystems Europe is a 3-phase brushless DC motor pre-driver integrated circuit with outputs for the direct high-current gate drive of an all N-channel power MOSFET 3-phase bridge with a maximum supply voltage of 38 V. The device includes three Hall-element inputs, a sequencer for commutation control, fixed off-time pulse width modulation (PWM) current control and locked rotor protection. Output current is scalable w...

22nd October 2007
LED driver with PWM brightness control for large display applications

The new A6281 from Allegro MicroSystems Europe is a three-channel constant-current LED driver IC with an on-chip oscillator for simple programmable brightness control. The new device is ideally suited to driving clusters of red/green/blue (RGB) LEDs in applications where the cluster forms one pixel in a large display or a lighting fixture. It precisely controls LED brightness via 10-bit pulse-width modulation (PWM) on each channel, complemented...

5th October 2007
DC motor driver IC from Allegro has typical input voltage range of 3 to 5.5V

The A3903 from Allegro MicroSystems Europe is a low-voltage bidirectional DC motor driver IC in an ultra-compact package measuring only 2 mm square and 0.55 mm high. The new device has a typical input voltage range of 3 to 5.5 V and produces an output current up to 500 mA. The output uses a full-bridge circuit incorporating source-side linear operation to produce a constant voltage across the motor coil. This regulated output minimises motor volt...

20th September 2007
Dual-channel Hall-effect direction detection sensor with built-in fault protection

The A3423 from Allegro MicroSystems Europe is a dual-channel Hall-effect sensor designed for use in speed and direction sensing applications incorporating encoder ring-magnet targets. The new device is highly sensitive and temperature stable, making it ideal for use in harsh automotive and industrial environments. Integrated protection against electromagnetic interference and electrostatic discharge, along with output short-circuit protection, m...

7th September 2007
Compact DMOS microstepping motor driver IC with built-in translator

The A4983 from Allegro MicroSystems Europe is a compact DMOS microstepping motor driver IC with built-in translator circuitry for easy operation. The new device combines an easy-to-use step and direction interface with a high output capability of up to 35 V and ±2 A and high-resolution microstepping control. It is designed for the PWM (pulse-width modulation) control of bipolar stepper motors in full-, half-, quarter-, eighth, and sixteenth-step...

22nd August 2007
Hot-swap protection IC uses Hall-effect current sensing

The ACS760 from Allegro MicroSystems Europe is a hot-swap protection IC designed for 12 V high-side applications. The new device combines Allegro's Hall-effect current sensing technology with hot-swap control circuitry, resulting in a highly efficient integrated controller. No external sense resistor is required, resulting in greatly reduced I2R losses in the power path.

11th August 2007
Motor-driver IC features integrated Hall-element commutation circuitry for driving vibration motors

The new A1442 from Allegro MicroSystems Europe is a full-bridge motor-driver integrated circuit which is optimised for driving vibration motors in applications such as mobile telephones, pagers, electronic toothbrushes, hand-held video game controllers and low-power fan motors.

24th July 2007
User-programmable Hall-effect linear sensors in miniature packages

Allegro MicroSystems Europe has introduced the first family of programmable Hall-effect linear sensors available in miniature package options: TO-92 (3-lead, single in-line package) or SOT-23W (3-lead, surface mount).

5th July 2007
High-efficiency motor driver IC offers high current rating from very small package

The new A3989 from Allegro MicroSystems Europe is a high-efficiency motor driver IC designed to drive one bipolar stepper motor at up to 1.2 A and one DC motor at up to 2.4 A. The A3989 is designed for applications, typically found in office automation, automated handling equipment and gaming machines, that incorporate one DC motor and one stepper motor. The integration of two motor drivers in one compact package makes the A3989 more cost effect...

20th June 2007
Dual-channel switch interface IC for Hall-effect sensor systems

The new A6850 from Allegro MicroSystems Europe is a dual-channel switch interface IC designed to simplify the implementation of two-wire Hall-effect sensor systems in automotive applications. The new device eliminates the need for an external sense resistor and comparator, thereby reducing system costs. The elimination of the sense resistor also results in a subsequent elimination of the voltage drop across the resistor, which can enable sensing ...

7th June 2007
Dual full-bridge motor driver IC drives two DC motors

The new A3995 from Allegro MicroSystems Europe is a DMOS full-bridge motor driver IC designed to control two DC motors at currents of up to 2.4 A and drive voltages of up to 36 V.The new device operates over a logic supply voltage range from 3 to 5.5 V, and incorporates two independent fixed off-time PWM (pulse-width modulation) current regulators that operate in either fast or slow decay mode. The use of fixed off-time PWM current control reduce...

23rd May 2007
LNB voltage regulator ICs for satellite receivers

Allegro MicroSystems Europe has introduced four new voltage regulator integrated circuits for use in the LNB (low noise block) sections of analogue and digital satellite receivers. The A8290 and A8291 are single LNB supply control voltage regulators, while the A8286 and A8292 are dual LNB supply voltage regulators. All are designed for high efficiency, using Allegro's advanced BCD process.

3rd May 2007
Hall-effect bipolar switch is optimised for pulsed power

The new A1205 from Allegro MicroSystems Europe is a general-purpose Hall-effect bipolar switch that is optimised for applications where pulsing the supply line is used to conserve power. The new device is a next-generation replacement of Allegro's popular A3134 bipolar switch but with enhanced performance in a more compact package. The A1205 is designed to switch in response to a north/south alternating magnetic field, typically from a multi-pole...

20th April 2007
Automotive grade relay driver IC

The new A2550 from Allegro MicroSystems Europe is an automotive grade relay driver IC which incorporates a 5 V voltage regulator, watchdog and reset circuitry, and three low-side DMOS relay driver outputs, providing robust performance over extended voltage and temperature ranges. The new device is designed to provide key functions in automotive relay-based applications where a microprocessor is used to implement complex system control and require...

5th April 2007
Digitally programmable dual full-bridge MOSFET driver IC

The new A3985 from Allegro MicroSystems Europe is a digitally programmable dual full-bridge gate driver IC suitable for driving a wide range of higher power industrial bipolar two-phase stepper motors, two-phase brushless DC motors or dual brush DC motors in industrial, medical and office automation applications. The compact package of the A3985 means that a complete high-current microstepping motor driver or dual DC motor system can be implemen...

26th March 2007
Charge-pump IC drives up to six white LEDs

The A8434 from Allegro MicroSystems Europe is a high-efficiency charge pump IC that offers a simple, low-cost method of driving up to six white LEDs in various application configurations. Using a proprietary adaptive control scheme (1x, 1.5x and 2x), the A8434 can deliver well-matched (within 0.5%) LED currents of up to 30 mA per LED channel while maintaining very high efficiency and low levels of electromagnetic interference. The LED current is ...

9th March 2007
Constant-current LED driver IC with PWM control

The A6280 from Allegro MicroSystems Europe is a new 3-bit constant current LED driver which enables users to minimise the number of components needed to drive LEDs with large pixel spacing. The new driver controls LED luminance using a pulse width modulation (PWM) scheme which gives the application the capability of displaying up to one billion colours. An external resistor is used to set the overall maximum current, which can be set over a wide ...

Test & Measurement
19th February 2007
Allegro MicroSystems Europe develops new simulation software for automotive sensors

Engineers at the Allegro MicroSystems Europe Sensor Applications Centre in Annecy, France, have developed a software simulator for the company's automotive Hall-effect sensors that has dramatically reduced development times and eased interaction with customers.

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