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文件名称:A3988SJP-T
文件大小:371KB
文件格式:PDF
更新时间:2016-03-24 14:30:40
A3988
The A3988 is a quad DMOS full-bridge driver capable of
driving up to two stepper motors or four dc motors. Each
full-bridge output is rated up to 1.2 A and 36 V. The A3988
includes fixed off-time pulse width modulation (PWM) current
regulators, along with 2- bit nonlinear DACs (digital-to-analog
converters) that allow stepper motors to be controlled in full,
half, and quarter steps, and dc motors in forward, reverse, and
coast modes. The PWM current regulator uses the Allegro®
patented mixed decay mode for reduced audible motor noise,
increased step accuracy, and reduced power dissipation.
Internal synchronous rectification control circuitry is provided
to improve power dissipation during PWM operation.
Protection features include thermal shutdown with hysteresis,
undervoltage lockout (UVLO) and crossover current protection.
Special power up sequencing is not required.
The A3988 is supplied in two packages, EV and JP, with
exposed power tabs for enhanced thermal performance. The
EV is a 6 mm x 6 mm, 36 pin QFN package with a nominal
overall package height of 0.90 mm. The JP is a 7 mm × 7 mm
48 pin LQFP. Both packages are lead (Pb) free, with 100%
matte tin leadframe plating.