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A3974

Allegro Micro Systems
Part Number A3974
Manufacturer Allegro Micro Systems
Description Dual Dmos Full-bridge Microstepping PWM Motor Driver
Published Apr 6, 2007
Detailed Description www.DataSheet4U.com 3974 LOAD 43 SUPPLY1 SENSE1 OUT1A ENABLE1 GND GND GND NC OUT1B NC NC DMOS DUAL FULL-BRIDGE PWM MOT...
Datasheet PDF File A3974 PDF File

A3974
A3974

Overview
www.
DataSheet4U.
com 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 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 isolation.
41 44 42 40 2 4 6 5 3 1 Data Sheet 29319.
35 VBB1 NC STROBE CLOCK 7 39 NC CP2 CP1 CP GND GND GND OSC SLEEP VREG NC 8 9 CHARGE PUMP SERIAL PORT 38 37 36 35 34 33 PROGRAM PWM TIMER LOGIC DATA 10 GND 11 GND 12 GND 13 REF1 14 REF2 15 LOGIC 16 SUPPLY NC 17 VDD ÷ ÷ PROGRAM PWM TIMER LOGIC 32 31 30 29 VBB2 OUT2A 18 NC 20 21 GND 22 23 GND 24 25 ENABLE2 26 NC 19 SENSE2 LOAD SUPPLY2 OUT2B 28 GND NC 27 Dwg.
PP-073 ABSOLUTE MAXIMUM RATINGS at TA = +25°C Load Supply Voltage, VBB .
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50 V Output Current, IOUT .
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±1.
5 A Logic Supply Voltage, VDD .
7.
0 V Logic Input Voltage Range, VIN Continous ...


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