Allegro 3974 DMOS Dual Full-Bridge PWM Motor Driver Data Manual

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DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER Designed for pulse-width modulated (PWM) current control LO LO

LY LY

of two dc motors, the A3974SED is capable of output currents to

LE LE

±1.5 A and operating voltages to 50 V. Internal fixed off-time

PWM current-control timing circuitry can be programmed via a

NC NC 2B 1B

serial interface to operate in slow, fast, and mixed current-decay

STROBE CP2

PROGRAM modes.

LOGIC

CLOCK PWM TIMER CP1

Independant ENABLE input terminals are provided for use in

DATA CP

controlling the speed and torque of each dc motor with externally

GND GND

applied PWM control signals.

GND GND

GND GND Synchronous rectification circuitry allows the load current to

REF1 OSC flow through the low r DS(on) of the DMOS output driver during

REF2 SLEEP the current decay. This feature will eliminate the need for

PROGRAM

LOGIC

PWM TIMER

LOGIC external clamp diodes in most applications, saving cost and

VDD VREG

SUPPLY

external component count, while minimizing power dissipation.

NC NC

Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VDD and the charge pump, and crossover-current protection. Special power-up

Dwg. PP-073

sequencing is not required.

ABSOLUTE MAXIMUM RATINGS The A3974SED is supplied in a 44-lead plastic PLCC with

at TA = +25°C four copper batwing tabs for maximum heat dissipation. The

Load Supply Voltage, VBB 50 V power tabs are at ground potential and need no electrical isola- tion.

Output Current, IOUT ±1.5 A Logic Supply Voltage, VDD 7.0 V

FEATURES

Logic Input Voltage Range, VIN

Continous -0.3 V to VDD + 0.3 V ±1.5 A, 50 V Continuous Output Rating

t W < 30 ns -1.0 V to VDD + 1.0 V

Low r DS(on) DMOS Output Drivers

Reference Voltage, VREF 3 V

Programmable Slow, Fast, and Mixed Current-Decay Modes

Sense Voltage (dc), VS

Continous 0.5 V Serial-Interface Controls Chip Functions

Synchronous Rectification for Low Power Dissipation

Package Power Dissipation, PD 3.9 W

Internal UVLO and Thermal Shutdown Circuitry

Operating Temperature Range,

TA -20°C to +85°C Crossover-Current Protection

Junction Temperature, TJ +150°C

Sleep and Idle Modes

Storage Temperature Range, TS -55°C to +150°C Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150°C.

Always order by complete part number: A3974SED .