New product with adaptive percentage fast decay (APFD) to reduce current ripple, improve microstepping accuracy, and reduce audible noise
Worcester, MA – Allegro MicroSystems, LLC unveiled a new four-way DMOS full-bridge driver IC, the A5990, which can drive two stepper motors or four DC motors, each with a rated output of up to 1.6A. And 40V. Allegro's A5990 integrates a fixed off-time pulse width modulation (PWM) current regulator and a 2-bit nonlinear digital-to-analog converter (DAC) for full, half, and quarter steps Control of the stepper motor or control the DC motor in forward, reverse and coast modes. For each full bridge, high-resolution microstepping control can be achieved with independent current-controlled reference voltage inputs. The A5990 PWM current regulator features an externally adjustable turn-off time that adjusts current control based on supply voltage and motor parameters (each bridge pair can be independently adjusted). The A5990 also features an Adaptive Percent Fast Fast Attenuation (APFD) option that automatically and continuously adjusts the fast decay portion of the turn-off time to improve step accuracy and reduce current ripple and power consumption. In addition, the A5990 can be set to use the AllegroTM patented hybrid attenuation mode with a fixed percentage fast decay of 30.1%.
The A5990 features an internal synchronous rectification control circuit that reduces power dissipation during PWM operation. To minimize power consumption when not in use, the A5990 can enter a low current sleep mode. The A5990's protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO), overcurrent protection (OCP), and cross current protection. No special power sequencing is required.
The A5990 is available in an EV package, a 6mm & TImes; 6mm 40-pin QFN package with a nominal package height of 0.90mm. The package is lead (Pb) free and features a 100% matte tin plated leadframe. The target market for the A5990 is mainly dual-axis multi-motor systems, including CCTV (PTZ up and down and left and right rotation control), 3D printing, point of sale (receipt and lottery printer), office automation (laser printer, copier, etc.), medical (diagnostic system) ) and industrial automation (ATM and pick and place equipment) markets and so on.
For pricing and other information on the A5990, please contact Allegro Shanghai.
About Allegro MicroSystems, LLCAllegro MicroSystems, LLC is a leader in the development, manufacture and sale of high performance semiconductors. Allegro's innovative solutions serve many high-growth applications in the automotive market, as well as office automation, industrial and consumer/communications. Headquartered in Worcester, Massachusetts, Allegro has design, application and sales support centers around the world. For more information on Allegro, please visit http://CN.
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