The PWM current regulator uses Allegro’s mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation. This device is targeted at the consumer and office automation markets with end applications to include closed circuit TV (pan and tilt) applications, scanners, POS, laser, inkjet and label printers.
Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. A low power sleep mode is included to reduce power dissipation. Protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover-current and over-current protection. Special power-up sequencing is not required.
The A5988 is supplied in two packages, EV and JP, with exposed power tabs for enhanced thermal performance. The EV is a 6 × 6 mm, 36-pin QFN package with a nominal overall package height of 0.90 mm. The JP is a 7 × 7 mm 48-pin LQFP.
Click for A5988 quad DMOS full-bridge driver IC data sheet.
Allegro MicroSystems; www.allegromicro.com