Tag Archives: Allegro MicroSystems

Allegro MicroSystems had introduced 1MHz bandwidth current sensors that can measure hundreds of amps – the first fruit of its acquisition of Crocus Technologies. The technology is tunneling magnetoresistance, and the sensors are intended to sit over the current-carrying PCB track to be measured. Output is a voltage linearly proportional to the current, responding within 300ns. There are two base ...

Allegro MicroSystems has announced a 4 x 4mm QFN current sensor that measures hundreds of amps bidirectionally, with a burden resistance of ~100μΩ (plus ~500pH). Called ACS37220, five versions are available, giving a choice of sensitivity (±100, 150 or 200A) and operation voltage (3.3 or 5V) – only the ±200A 3.3V option is not available (see table). Power consumption is ...

Allegro MicroSystems has introduced a pair of surface-mount current sensors that work from dc to 5MHz. Variants allow six sensitivities between 66mV/A (±20A range) and 20.3mV/A (±65A). Response time is typically 40ns. They are “fast enough for SiC and GaN protection, while also providing low-frequency content for power-conversion control”, said Allegro product manger Matt Hein. ACS37030 and ACS37032 employ dual ...

Allegro MicroSystems has created an isolated gate driver IC for GaN power transistors that has no need for high-side bootstrapping nor the provision of a secondary side drive supply voltage. Instead, a dc-dc converter within AHV85111 produces secondary-side dc power rails – one positive and one negative – to provide gate drive power from a 12V supply (10.8 – 13.2V) ...

The rise in popularity of electric bikes and two-wheelers has brought to focus the need for increased safety requirements. By Vashist Bist and Shashank Wekhande. The choice of battery greatly affects the design of an electric two-wheeler (E2W). Lithium-iron-phosphate (LiFePO4) batteries provide a stable chemical and thermal chemistry, better safety (no thermal runaway) and lower manufacturing cost compared to Li-ion ...

Allegro MicroSystems has announced an ASIL C safety rated magnetic field beased current sensor for electric vehicle power trains and automotive battery management systems. The company “has developed the ACS37601 programmable linear Hall-effect current sensor IC with over-current, over-temperature and self-test capabilities,” it said. The part “is Allegro’s highest-accuracy field current sensor for applications requiring measurement capability greater than 200A”. ...

Allegro MicroSystems has released two automotive magnetic sensors, one for crankshafts and one for camshafts, both using the giant magnetoresistance (GMR) effect. Although both come in a simple three-pin single in-line package, they are sophisticated digital processing ICs, and system-in-packages as they also incorporate a bias magnet and EMC protection components. Crankshaft The ATS16951 crankshaft sensor is designed to be a ...

Allegro is claiming a record for its latest Hall-effect position sensor IC, describing it as “the smallest sine/cosine 3D sensor currently available in the market”. Called A33230, it comes in 3 x 2.9 x 1mm 5pin SOT23-W package. Although the die inside is able to sense in three orthogonal dimensions, it has two signal paths and devices are factory programmed ...

ICEYE, the Finnish satellite imagery specialist, has entered into an R&D agreement with the U.S. Army to advance the Earth observation technology supporting army missions. Specifically, the cooperative research and development agreement (CRADA) is with the U.S. Army’s Space and Missile Defense Technical Center (SMDTC). They will explore together low-cost, on-orbit, synthetic-aperture radar (SAR) related concepts, says ICEYE. SAR The ...

Allegro MicroSystems has added two LED drivers to its automotive portfolio. A80803 is a boost and buck-boost dc-dc converter for headlights, that includes switching for high-beam and dip-beam strings. It works with inputs over 5 to 37 V (40V abs max for load dump, 4.5V under-voltage lock-out). Output can be up to 70V Drivers are included for external high and low-side dc-dc mosfets ...