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参数资料
| 型号： | A3988SEVTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR PWM QUAD 36-QFN |
| 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： | 36-VFQFN 裸露焊盘 |
| 供应商设备封装： | 36-QFN-EP（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1176-6 |
A3988
Quad DMOS Full Bridge PWM Motor Driver
Synchronous Rectification When a PWM-off cycle is
triggered by an internal fixed off-time cycle, load current will
recirculate. The A3988 synchronous rectification feature will turn
on the appropriate MOSFETs during the current decay, and effec-
tively short out the body diodes with the low R DS(on) driver. This
significantly lowers power dissipation. When a zero current level
is detected, synchronous rectification is turned off to prevent
reversal of the load current.
V PHASE
+
Mixed Decay Operation The bridges operate in mixed
decay mode. Referring to figure 2, as the trip point is reached, the
device goes into fast decay mode for 30.1% of the fixed off-time
period. After this fast decay portion, t FD , the device switches
to slow decay mode for the remainder of the off-time. During
transitions from fast decay to slow decay, the drivers are forced
off for approximately 600 ns. This feature is added to prevent
shoot-through in the bridge. As shown in figure 2, during this
“dead time” portion, synchronous rectification is not active, and
the device operates in fast decay and slow decay only.
I OUT
0
–
9 μ s
Enlargement A
Fixed Off-Time 30 μ s
21 μ s
See Enlargement A
I Trip
I OUT
FD SR
SD SR
FD DT
SD DT
Figure 2. Mixed Decay Mode Operation
SD DT
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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| A39899 | 制造商:n/a 功能描述:Power Semiconductor |
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