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| 型号： | A3950SLP-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER PWM FULL 16-TSSO |
| 标准包装： | 96 |
| 应用： | PWM 电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±2.8A |
| 电源电压： | 8 V ~ 36 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 其它名称： | 620-1064 |
A3950
DMOS Full-Bridge Motor Driver
Applications Information
Power Dissipation . First order approximation of power
dissipation in the A3950 can be calculated by first examining
the power dissipation in the full-bridge during each of the
operation modes. The A3950 features synchronous rectifica-
tion, a feature that effectively shorts out the body diode by
turning on the low R DS(on) DMOS driver during the decay
cycle. This significantly reduces power dissipation in the
full-bridge. In order to prevent shoot-through, where both
VBB
source and sink driver are on at the same time, the A3950
implements a 500 ns typical crossover delay time. For this
period, the body diode in the decay current path conducts
the current until the DMOS driver turns on. This does affect
power dissipation and should be considered in high current,
high ambient temperature applications. In addition, motor
parameters and switching losses can add power dissipation
that could affect critical applications.
Drive Current . This current path is through source DMOS
driver, motor winding, and sink DMOS driver. Power dissi-
pation is I 2 R loses in one source and one sink DMOS driver,
as shown in the following equation:
P D = I 2 ( R DS(on)Source + R DS(on)Sink )
Fast Decay with Synchronous Rectification . This
(1)
1
3
2
1 Drive current
2 Fast decay with synchronous rectification (reverse)
decay mode is equivalent to a phase change where the oppo-
site drivers are switched on. When in fast decay, the motor
current is not allowed to go negative (direction change).
Instead, as the current approaches zero, the drivers turn off.
The power calculation is the same as the drive current calcu-
lation, equation 1:
Slow Decay SR (Brake Mode) . In this decay mode, both
sink drivers turn on, allowing the current to circulate through
the sink drivers and the load. Power dissipation is I 2 R loses
in the two sink DMOS drivers:
3 Slow decay with synchronous rectification (brake)
Figure 1. Current Decay Patterns
P D = I 2 ( 2 × R DS(on)Sink )
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
(2)
9
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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| A3959SLP-T | IC MOTOR DRIVER PWM FULL 28TSSOP |
| A3966ELBTR-T | IC MOTOR DVR FULL BRIDGE 16SOICW |
| A3967SLB-T | IC MOTOR DRIVER PWM FULL 24-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A3950SLP-T | 制造商:Allegro MicroSystems 功能描述:DMOS Driver |
| A3950SLPTR-T | 功能描述:IC MOTOR DVR FULL BRIDGE 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| A3951 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:FULL-BRIDGE PWM MOTOR DRIVER |
| A3951SB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:FULL-BRIDGE PWM MOTOR DRIVER |
| A3951SW | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:FULL-BRIDGE PWM MOTOR DRIVER |
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