Datasheet > 3957

3957

更新时间： 2024-10-14 22:13:47

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器连接器电机
页数	文件大小	规格书
16页	151K
描述
FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

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3957 数据手册

3957

FULL-BRIDGE PWM

MICROSTEPPING MOTOR DRIVER

The A3957SA and A3957SLB are designed for driving one winding of a

bipolar stepper motor in a microstepping mode. The outputs are rated for

continuous output currents to ±1.5 A and operating voltages to 50 V. Internal

pulse-width modulated (PWM) current control combined with an internal

four-bit nonlinear digital-to-analog converter allows the motor current to be

controlled in full-, half-, quarter-, eighth-, or sixteenth-step (microstepping)

modes. Nonlinear increments minimize the number of control lines necessary

for microstepping. Microstepping provides for increased step resolution, and

reduces torque variations and resonance problems at low speed.

A3957SLB

CONNECT

NC 24

LOAD

SUPPLY

PFD

REF

OUT

CONNECT

NC 21

GROUND

19 GROUND

18 GROUND

LOGIC

Internal circuitry determines whether the PWM current-control circuitry

operates in a slow (recirculating) current-decay mode, fast (regenerative)

current-decay mode, or in a mixed current-decay mode in which the off time

is divided into a period of fast current decay with the remainder of the fixed

off time spent in slow current decay. The combination of user-selectable

current-sensing resistor and reference voltage, digitally selected output

current ratio; and slow, fast, or mixed current-decay modes provides users

with a broad, variable range of motor control.

NC 16

SENSE

CONNECT

LOGIC

SUPPLY

PHASE 10

OUT

CONNECT

Internal circuit protection includes thermal shutdown with hysteresis,

transient-suppression diodes, and crossover current protection. Special

power-up sequencing is not required.

Dwg. PP-056-4

ABSOLUTE MAXIMUM RATINGS

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

Output Current, I_OUT

The A3957S— is supplied in a choice of two power packages; a 16-pin

dual-in-line plastic package (suffix ‘A’), and a 24-lead plastic SOIC with

copper heat-sink tabs (suffix ‘LB’). The power tab is at ground potential and

needs no electrical isolation.

(Continuous) . . . . . . . . . . . . . ±1.5 A*

Logic Supply Voltage, V_CC. . . . . . . 7.0 V

Logic/Reference Input Voltage Range,

V_IN. . . . . . . . . . -0.3 V to V_CC+ 0.3 V

Sense Voltage, V_S. . . . . . . . . . . . . . . 1.0 V

Package Power Dissipation (T_A= 25°C), P_D

A3957SA . . . . . . . . . . . . . . . . 2.08 W†

A3957SLB. . . . . . . . . . . . . . . 2.23 W†

Operating Temperature Range,

FEATURES

■ ±1.5 A Continuous Output Current

■ 50 V Output Voltage Rating

■ Internal PWM Current Control

■ 4-Bit Non-Linear DAC for 16-Bit Microstepping

■ Satlington™ Sink Drivers

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

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

Storage Temperature Range,

■ Fast, Mixed Fast/Slow, and Slow Current-Decay Modes

■ Internal Transient-Suppression Diodes

■ Internal Thermal-Shutdown Circuitry

■ Crossover-Current and UVLO Protection

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:

† Per SEMI G42-88 Specification, Thermal Test

Board Standardization for Measuring Junction-

to-Ambient Thermal Resistance of Semiconductor

Packages..

Part Number

A3957SA

Package

R_θJA

R_θJC

38°C/W

—

R_θJT

—

16-pin DIP

60°C/W

56°C/W

A3957SLB

24-lead batwing SOIC

6°C/W

12 3 4 5 6 7...16

中文翻译

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与3957相关器件

型号	品牌	获取价格	描述	数据表
3958	ALLEGRO	获取价格	DMOS FULL-BRIDGE PWM MOTOR DRIVER
3958_02	ALLEGRO	获取价格	DMOS FULL-BRIDGE PWM MOTOR DRIVER
39583	SCHOTT	获取价格	TRANSFORMER
395930602	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930603	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930606	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930610	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930613	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930614	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE
395930616	MOLEX	获取价格	Barrier Strip Terminal Block, 5.00MM EURO TERM BLOCK VERTICAL, PC MOUNT, LOW PROFILE

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