Datasheet > 3973

3973

更新时间： 2024-02-20 01:23:30

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器电机
页数	文件大小	规格书
12页	201K
描述
DUAL DMOS FULL-BRIDGE MICROSTEPPING PWM MOTOR DRIVER

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3973 技术参数

生命周期：	Active	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8536.90.40.00
风险等级：	5.74	终端性别：	MALE
端子和端子排类型：	PCB TERMINAL	Base Number Matches：	1

3973 数据手册

3973

DUAL DMOS FULL-BRIDGE MICRO-

STEPPING PWM MOTOR DRIVER

PRELIMINARY INFORMATION

(Subject to change without notice)

December 1, 2000

Designed for pulse-width modulated (PWM) current control of

bipolar microstepping stepper motors, the A3973SB and A3973SLB are

capable of continuous output currents to 1 A and operating voltages to

35 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. The A3973SB (DIP) and the A3973SLB (SOIC)

are electrically identical and differ only in package style.

The desired load-current level is set via the serial port with two 6-bit

linear DACs in conjunction with a reference voltage. The six bits of

control allow maximum flexibility in torque control for a variety of step

methods, from microstepping to full-step drive. Load current is set in

1.56% increments of the maximum value.

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.

Internal circuit protection includes thermal shutdown with hyster-

esis, transient-suppression diodes, and crossover-current protection.

Special power-up sequencing is not required.

VCP

CP1

CP2

OSC

23 SLEEP

VREG

OUT1B

LOAD

21 OUT2B

LOAD

SUPPLY

BB1

BB2

GROUND

SENSE

OUT2A

LOGIC

OUT1A

STROBE

VDD

SUPPLY

MUX

CLOCK

REF

DATA 12

Dwg. PP-069-3

ABSOLUTE MAXIMUM RATINGS

The A3973SB is supplied in a 24-lead plastic DIP with a copper

batwing power tab; the A3973SLB is supplied in a 24-lead plastic SOIC

with a copper batwing power tab for surface-mount applications. The

power tabs are at ground potential and need no electrical isolation.

at T_A= +25°C

Load Supply Voltage, V_BB................ 35 V

Output Current, I_OUT...................... 1.0 A

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

Logic Input Voltage Range,

FEATURES

V_IN................ -0.3 V to V_DD+ 0.3 V

1 A, 35 V Continuous Output Rating

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

Sense Voltage (dc), V_S................ 500 mV

Package Power Dissipation, P_D

A3973SB ............................... 3.1 W

A3973SLB ............................ 2.2 W

Operating Temperature Range,

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

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

Storage Temperature Range,

I Low r_DS(on)DMOS Output Drivers

I Optimized Microstepping via 6-Bit Linear DACs

I Programmable Mixed, Fast, and Slow Current-Decay Modes

I 4 MHz Internal Oscillator for Digital Timing

I Serial-Interface Controls Chip Functions

I Synchronous Rectification for Low Power Dissipation

I Internal UVLO and Thermal Shutdown Circuitry

I Crossover-Current 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 tempera-

ture of 150°C.

I Precision 2 V Reference

I Inputs Compatible with 3.3 V or 5 V Control Signals

I Sleep and Idle Modes

Always order by complete part number, e.g., A3973SB .

12 3 4 5 6 7...12

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