A3974SED-T

更新时间： 2024-01-17 20:07:16

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	618K
描述
DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER

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A3974SED-T 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	LCC	包装说明：	QCCJ, LDCC44,.7SQ
针数：	44	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.89	Is Samacsys：	N
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	S-PQCC-J44
长度：	16.585 mm	湿度敏感等级：	1
功能数量：	2	端子数量：	44
最高工作温度：	85 °C	最低工作温度：	-20 °C
最大输出电流：	1.5 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	QCCJ	封装等效代码：	LDCC44,.7SQ
封装形状：	SQUARE	封装形式：	CHIP CARRIER
峰值回流温度（摄氏度）：	225	电源：	5 V
认证状态：	Not Qualified	座面最大高度：	4.57 mm
子类别：	Motion Control Electronics	最大供电电流 (Isup)：	10 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	OTHER	端子形式：	J BEND
端子节距：	1.27 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	16.585 mm
Base Number Matches：	1

A3974SED-T 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

Independant ENABLE input terminals are provided for use in

STROBE

CLOCK

controlling the speed and torque of each dc motor with externally

CP2

CP1

applied PWM control signals.

PROGRAM

PWM TIMER

LOGIC

Synchronous rectification circuitry allows the load current to

DATA 10

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

hysteresis, undervoltage monitoring of V_DDand the charge

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

sequencing is not required.

GND

OSC

SLEEP

REF

PROGRAM

PWM TIMER

LOGIC

SUPPLY

VREG

VDD

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.

BB2

Dwg. PP-073

ABSOLUTE MAXIMUM RATINGS

FEATURES

at T_A= +25°C

■ ±1.5 A, 50 V Continuous Output Rating

■ Low r_DS(on)DMOS Output Drivers

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

■

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 ................... -0.3 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

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

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

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

Operating Temperature Range,

■ Sleep and Idle Modes

Selection Guide

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

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

Storage Temperature Range,

Part Number

A3974SED-T

A3974SEDTR-T

Pb-free*

Yes

Package

44-pin PLCC

Packing

27 per tube

450 per reel

Yes

*Pb-based variants are being phased out of the product line. The variants cited in

this footnote are in production but have been determined to be LAST TIME BUY.

This classification indicates that sale of this device is currently restricted

to existing customer applications. The variants should not be purchased for new

design applications because obsolescence in the near future is probable. Samples

are no longer available. Status change: October 31, 2006. Deadline for LAST TIME

BUY orders: April 27, 2007. Th.ese variants include: A3974SED and A3974SEDTR.

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.

12 3 4 5 6 7...12

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