Allegro 3974 DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER handbook
The A3974SED is a dual full-bridge PWM motor driver designed for pulse-width modulated (PWM) current control of two dc motors. It can output ±1.5 A current and operate at up to 50 V. The internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. Independent ENABLE input terminals are provided for use in controlling the speed and torque of each dc motor with externally applied PWM control signals. Synchronous rectification circuitry allows the load current to flow through the low rDS(on) of the DMOS output driver during the current decay. This feature will eliminate the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VDD and the charge pump, and crossover-current protection. Special power-up sequencing is not required. The A3974SED is supplied in a 44-lead plastic PLCC with four copper batwing tabs for maximum heat dissipation. The power tabs are at ground potential and need no electrical isola- tion.
Brand: ALLEGRO
File format: PDF
Size: 161 KB
MD5 Checksum: 8D6165A53B7FD0C1AFFAD7ACE51FF8D0
Publication date: 03 August, 2012
Downloads: -
PDF Link: Allegro 3974 DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER handbook PDF