3948 Datasheet (Allegro MicroSystems) - DMOS FULL-BRIDGE PWM MOTOR DRIVER

3948, DMOS FULL-BRIDGE PWM MOTOR DRIVER

Serial Interface.

The A3948 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 clocked in starting with D19.

Bit D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D1

3948 A3948SLB (SOIC) CP CP2 CP1 PHASE OSC GROUND GROUND LOGIC SUPPLY ENABLE DATA CLOCK STROBE DMOS FULL-BRIDGE PWM MOTOR DRIVER 1 2 3 4 5 θ 24 23 NC 22 21 VBB 20 19 18 V DD 17 16 VREG RANGE NO CONNECTION OUTB LOAD SUPPLY GROUND GROUND SENSE OUTA NO CONNECTION MODE REF Designed for pulse-width modulated (PWM) current control of dc motors, the A3948SB and A3948SLB are capable of continuous output currents to ±1.5 A and operating voltages to 50 V.

Internal fixed offtime PWM current-control timing

3948 Features

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