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| 型号： | A3988SJP-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DVR PWM FULL BRG 48LQFP |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，步进电机驱动器 |
| 输出数： | 2 或 4 |
| 电流 - 输出： | ±1.2A |
| 电压 - 负载： | 8 V ~ 36 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP 裸露焊盘 |
| 供应商设备封装： | 48-LQFP 裸露焊盘（7x7） |
| 包装： | 管件 |
A3988
Quad DMOS Full Bridge PWM Motor Driver
Applications Information
Motor Configurations For applications that require either a
stepper/DC motor driver or dual DC motor driver, Allegro offers
the A3989 and A3995. These devices are offered in the same
36 pin QFN package as the A3988. The DC motor drivers are
capable of supplying 2.4 A at 36 V. Commutation is done with a
standard phase/enable logic interface. Please refer to the Allegro
website for further information and datasheets about those
devices.
DC Motor Control Each of the 4 full bridges has independent
PWM current control circuitry that makes the A3988 capable of
driving up to four DC motors at currents up to 1.2 A. Control of
the DC motors is accomplished by tying the I0, I1 pins together
creating an equivalent ENABLE function with maximum current
defined by the voltage on the corresponding VREF pin. The DC
motors can be driven via a PWM signal on this enable signal, or
soldered directly to an exposed surface on the PCB. Thermal vias
are used to transfer heat to other layers of the PCB.
Grounding In order to minimize the effects of ground bounce
and offset issues, it is important to have a low impedance single-
point ground, known as a star ground , located very close to the
device. By making the connection between the exposed thermal
pad and the groundplane directly under the A3988, that area
becomes an ideal location for a star ground point.
A low impedance ground will prevent ground bounce during
high current operation and ensure that the supply voltage remains
stable at the input terminal. The recommended PCB layout shown
in the diagram below, illustrates how to create a star ground
under the device, to serve both as low impedance ground point
and thermal path.
on the corresponding PHASE pin. Motor control includes for-
ward, reverse, and coast.
Layout The printed circuit board should use a heavy ground-
plane. For optimum electrical and thermal performance, the
A3988 must be soldered directly onto the board. On the under-
side of the A3988 package is an exposed pad, which provides a
PCB
A3988
Solder
Trace (2 oz.)
Signal (1 oz.)
Ground (1 oz.)
Thermal (2 oz.)
path for enhanced thermal dissipation. The thermal pad should be
VBB
Thermal Vias
V BB
CVCP
GND
CCP
CVCP
CIN3
GND
CCP
CIN3
OUT1A
OUT1B
RS1
U1
RS3
OUT3A
OUT3B
1
I04
OUT1A
SENSE1
A3988
I13
OUT3A
SENSE3
RS1
CIN1
OUT1B
VBB1
OUT2B
PAD
OUT3B
VBB2
OUT4B
RS3
CIN2
OUT2B
OUT2A
CIN1
RS2
CIN2
RS4
OUT4B
OUT4A
RS2
SENSE2
OUT2A
PHASE4
SENSE4
OUT4A
I14
RS4
CVDD1
VDD
CVDD2
GND
EV package layout shown
CVDD1
CVDD2
Figure 6. Printed circuit board layout with typical application circuit, shown at right. The copper area directly under the
A3988 (U1) is soldered to the exposed thermal pad on the underside of the device. The thermal vias serve also as electrical
vias, connecting it to the ground plane on the other side of the PCB , so the two copper areas together form the star ground.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| A3989SEVTR-T | IC STEPPER/MOTOR DRIVER 36-QFN |
| A3992SB-T | IC MOTOR DRVR PWM DUAL 24-DIP |
| A3995SEVTR-T | IC MOTOR DRIVER PWM DUAL 36-QFN |
| A3998SETTR-T | IC MOTOR DRIVER DUAL DMOS QFN |
| A4401KL-T | IC QUASI FLYBACK CONVERTER 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A3988SJPTR-T | 功能描述:IC PWM MOTR DVR FULL BRDG 48LQFP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A3989 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Bipolar Stepper and High Current DC Motor Driver |
| A3989_V | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Bipolar Stepper and High Current DC Motor Driver |
| A39899 | 制造商:n/a 功能描述:Power Semiconductor |
| A3989SEV-T | 制造商:Allegro MicroSystems 功能描述:Motor Driver IC |
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