The new A4983 from Allegro MicroSystems is a compact DMOS microstepping motor driver IC with built-in translator circuitry for easy operation.
The 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 modes, and is targeted toward the office automation, industrial and medical markets.
The use of synchronous rectification reduces power dissipation and minimises the need for Schottky diodes, while the low-resistance DMOS outputs further limit power dissipation and allow higher average output currents because of the lower die temperature rise.
The built-in translator circuitry makes the A4983 easy to operate, and requires only two control lines. Simply inputting one pulse on the 'step' input drives the motor by one microstep. There are no phase sequence tables, high-frequency control lines, or complex interfaces to program, making the device an ideal fit for applications where a complex microprocessor is unavailable or overburdened.
The A4983 includes a fixed off-time current regulator, which has the ability to operate in slow or mixed decay modes. The chopping control in the A4983 automatically selects the current decay mode (slow or mixed). When a signal occurs at the 'step' input pin, the A4983 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to slow decay. If the change is to a lower current, then the current decay is set to mixed (set initially to a fast decay for a period amounting to 31,25% of the fixed off-time, then to a slow decay for the remainder of the off-time). This current decay control scheme results in reduced audible motor noise, increased step accuracy and reduced power dissipation.
Internal circuit protection includes thermal shutdown with hysteresis, under-voltage lockout (UVLO), and crossover-current protection. Special power-on sequencing is not required. A 'sleep' mode with a current consumption of only 10 μA is also available.
NVDC power-path control to 1– 6 cell battery systems iCorp Technologies
Power Electronics / Power Management
SG Micro’s SGM41581 is an I2C-controlled narrow voltage direct charging buck boost charge controller designed to simplify robust power delivery in systems that must seamlessly operate from an adapter input or a battery pack.
Read more...Precise, adaptive battery health-monitoring RS South Africa
Power Electronics / Power Management
New fuel gauge solution from Nordic delivers State-of-Health reporting, adaptive battery modelling, and seamless fleet observability via nRF Cloud.
Read more...Compact 6 A automotive buck converter Altron Arrow
Power Electronics / Power Management
Delivering up to 6 A of continuous output current, the DCP0606Y from STMicroelectronics enables efficient regulation of low-voltage rails commonly used in modern vehicle electronics and industrial systems.
Read more...Next-gen modules for rugged edge AI systems Altron Arrow
Computer/Embedded Technology
Designed for real-world edge deployments where systems do not sit still, SolidRun’s P100 COMx6 series targets mobile platforms as well as harsh, mission-critical environments.
Read more...The new role of UPS technology in high-precision automation Omron Electronics
Power Electronics / Power Management
OMRON’s BU_2SW and BU_2RWL series UPS systems are engineered to offer a robust, online type power architecture designed to safeguard sensitive AC powered systems across a wide range of industries.
Read more...Rugged railway-grade DC-DC power modules iCorp Technologies
Power Electronics / Power Management
iCorp Technologies has introduced the AIPUPOWER ZCD100 and ZCD150 Series, a family of rugged DC-DC converters designed to meet the demanding electrical and environmental requirements of railway and transportation systems.
Read more...NXP has expanded its MCX A Series Altron Arrow
AI & ML
NXP has significantly expanded its MCX A Series of Arm Cortex-M33 microcontrollers, doubling the portfolio with six new families aimed at industrial and IoT edge applications.
Read more...Four-quadrant regenerative grid simulator Conical Technologies
Power Electronics / Power Management
The IT7900EP series high-performance regenerative grid simulator from ITECH is a full four-quadrant AC grid simulator capable of both sourcing and sinking power.
Read more...90 W PSU with 150% boost capability Brabek
Power Electronics / Power Management
RECOM’s cost effective REFIN2U-S90/CL DIN rail AC/DC boasts a 90 W rating with a boost capability of 150% for 4,5 seconds to allow for surge loads.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version