A3992SBT-

更新时间： 2024-02-05 12:35:53

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
13页	477K
描述
DMOS Dual Full-Bridge Microstepping PWM Motor Driver

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技术参数
数据手册

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A3992SBT- 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	HTSSOP, TSSOP24,.25	针数：	24
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.13
Is Samacsys：	N	其他特性：	ALSO REQUIRES 15V TO 50V VBB SUPPLY
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	R-PDSO-G24
JESD-609代码：	e3	长度：	7.8 mm
湿度敏感等级：	2	功能数量：	1
端子数量：	24	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：	HTSSOP
封装等效代码：	TSSOP24,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	50 V	认证状态：	Not Qualified
座面最大高度：	1.2 mm	子类别：	Motion Control Electronics
最大供电电流 (Isup)：	12 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	技术：	NMOS
温度等级：	OTHER	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	4.4 mm	Base Number Matches：	1

A3992SBT- 数据手册

DMOS Dual Full-Bridge

Microstepping PWM Motor Driver

A3992

Synchronous Rectiﬁcation. When a PWM off-cycle with the two serial port control bits:

1. Active mode. Prevents reversal of load current.

is triggered, by a bridge disable command or internal

ﬁxed off-time cycle, load current recirculates accord-

ing to the decay mode selected by control logic. The

A3992 synchronous rectiﬁcation feature turns on the

appropriate MOSFETs during current decay, and effec-

tively shorts out the body diodes with the low R_DS(on)

driver. This lowers power dissipation signiﬁcantly, and

can eliminate the need for external Schottky diodes for

most applications.

Turns off synchronous rectiﬁcation when a 0 current

level is detected.

2. Passive mode. Allows reversal of current, but will

turn off the synchronous rectiﬁer circuit if the load

current inversion ramps up to the current limit.

3. Disabled. Prevents MOSFET switching during load

recirculation in fast decay portion of the off-time. Dur-

ing the slow decay portion of the off-time, the low-side

switch turns on, which recirculates current through the

low-side MOSFET and low-side body diode.

Three distinct modes of operation can be conﬁgured

Applications Notes

Current Sensing. To minimize inaccuracies in sens-

ing the I_PEAKcurrent level caused by ground trace I•R

drops, the sense resistor should have an independent

ground return to the GND terminal of the device. For

low value sense resistors, the I•R drops in the PCB

sense resistor traces can be signiﬁcant and should

be taken into account. The use of sockets should

be avoided because they can introduce variation in

Thermal Protection. Circuitry turns off all drivers

when the junction temperature reaches 165°C typical.

It is intended only to protect the device from failures

due to excessive junction temperatures, and should not

imply that output short circuits are permitted. Thermal

shutdown has a hysteresis of approximately 15°C.

Serial Port Write Timing Operation. Data is clocked

into a shift register on the rising edge of a CLOCK

signal. Normally, STROBE is held high, and is only

brought low to initiate a write cycle. The data is writ-

ten MSB ﬁrst. Refer to the diagram below for timing

requirements.

R_SENSEdue to their contact resistance.

Allegro MicroSystems recommends a value of R_SENSE

given by:

_SENSE= 0.5 / I_{TRIP MAX}

STROBE

CLOCK

DATA

MSB

LSB - D0

SLEEP

Serial Port Timing Diagram

A. Minimum Data Setup Time

B. Minimum Data Hold Time

C. Minimum Setup Strobe to Clock rising edge

D. Minimum Clock High Pulse Width

E. Minimum Clock Low Pulse Width

15 ns F. Minimum Setup Clock rising edge to Strobe

10 ns G. Minimum Strobe Pulse Width

120 ns H. Minimum Sleep to Clock Setup Time

40 ns I. Setup “Idle” Release to Output Enable

40 ns

50 ns

120 ns

50 μs

1 ms

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

1...6 7 8910 11 12 13

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A3995	ALLEGRO	DMOS Dual Full Bridge PWM Motor Driver	获取价格
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