3974 Datasheet (Allegro MicroSystems) - DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER

3974, DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER

Serial Interface.

The A3974SED is controlled via a 3-wire (clock, data,strobe) serial port.

The programmable functions allow maximum flexibility in configuring the PWM to the motor drive requirements.

The serial data is written as two 20bit words: 1 bit to select the word and 19 bits of data.

The da

3974 LOAD 43 SUPPLY1 SENSE1 OUT1A ENABLE1 GND GND GND NC OUT1B NC NC DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER Designed for pulse-width modulated (PWM) current control of two dc motors, the A3974SED is capable of output currents to ±1.5 A and operating voltages to 50 V.

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.

Independant ENABLE input terminals are provided for use in controlling t

3974 Features

* s ±1.5 A, 50 V Continuous Output Rating s Low rDS(on) DMOS Output Drivers s Programmable Slow, Fast, and Mixed Current-Decay Modes s Serial-Interface Controls Chip Functions s Synchronous Rectification for Low Power Dissipation s Internal UVLO and Thermal Shutdown Circuitry s Crossover-Current Prote