Datasheet > 3974

3974

更新时间： 2024-02-02 05:06:28

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
12页	159K
描述
DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER

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3974 数据手册

3974

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.

BB1

STROBE

CLOCK

CP2

CP1

PROGRAM

PWM TIMER

LOGIC

Independant ENABLE input terminals are provided for use in

controlling the speed and torque of each dc motor with externally

applied PWM control signals.

DATA 10

GND

OSC

SLEEP

Synchronous rectification circuitry allows the load current to

flow through the low r_DS(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.

REF

PROGRAM

PWM TIMER

LOGIC

SUPPLY

VREG

VDD

BB2

Internal circuit protection includes thermal shutdown with

hysteresis, undervoltage monitoring of V_DDand the charge

pump, and crossover-current protection. Special power-up

sequencing is not required.

Dwg. PP-073

ABSOLUTE MAXIMUM RATINGS

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.

at T_A= +25°C

Load Supply Voltage, V_BB............................ 50 V

Output Current, I_OUT.................................. ±1.5 A

Logic Supply Voltage, V_DD.......................... 7.0 V

Logic Input Voltage Range, V_IN

FEATURES

■ ±1.5 A, 50 V Continuous Output Rating

■ Low r_DS(on)DMOS Output Drivers

Continous ................... -0.3 V to V_DD+ 0.3 V

t_W< 30 ns ................... -1.0 V to V_DD+ 1.0 V

Reference Voltage, V_REF................................. 3 V

Sense Voltage (dc), V_S

■

Programmable Slow, Fast, and Mixed Current-Decay Modes

■ Serial-Interface Controls Chip Functions

■ Synchronous Rectification for Low Power Dissipation

■ Internal UVLO and Thermal Shutdown Circuitry

■ Crossover-Current Protection

Continous .............................................. 0.5 V

t_W< 1 µs ................................................ 2.5 V

Package Power Dissipation, P_D.................. 3.9 W

Operating Temperature Range,

T_A......................................... -20°C to +85°C

Junction Temperature, T_J......................... +150°C

Storage Temperature Range,

■ Sleep and Idle Modes

T_S....................................... -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 .

12 3 4 5 6 7...12

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3974_1	ALLEGRO	获取价格	DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER
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