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| 型号： | A3941KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | IC MOSFET FULL BRDG AUTO 28TSSOP |
| 标准包装： | 1 |
| 配置： | 半桥 |
| 输入类型： | PWM |
| 延迟时间： | 90ns |
| 配置数： | 1 |
| 输出数： | 4 |
| 电源电压： | 5.5 V ~ 50 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1236-6 |
A3941
Automotive Full Bridge MOSFET Driver
schemes, the PHASE input is still required to reverse the load
current.
Although fast decay with diode rectification provides a higher
degree of current control than slow decay schemes, it still may
GHA
GLA
LOAD
GHB
GLB
GHA
GLA
LOAD
GHB
GLB
not provide sufficient control for servo systems where full four-
quadrant control is required. This is only possible using fast
Driving
Recirculating
decay with synchronous rectification. By applying the PWM sig-
nal to the PHASE input, and holding PWMH and PWML and SR
high (figure 2B), the load current can be controlled in both direc-
Inputs
PWMH
PWML
PHASE
SR
1
1
1
0
Outputs
Phase A B
GHx H L
GLx L H
Inputs
PWMH
PWML
PHASE
SR
0
0
1
0
Outputs
Phase A B
GHx L L
GLx L L
tions with a single PWM signal. Because all four MOSFETs in
the bridge change state, the supply can be directly applied to the
load in either direction. The effect is: when the PWM duty cycle
is less than 50%, the average current flows from B to A; when
(A) Fast decay, diode recirculation
greater than 50%, the average current flows from A to B; and
when at 50%, the average current is zero. This allows the load
current to be independent of any back EMF voltage generated, for
GHA
GLA
LOAD
GHB
GLB
GHA
GLA
LOAD
GHB
GLB
example by a rotating motor, and effectively allowing the applied
torque to work with or against a motor in either direction.
Driving
Recirculating
Inputs
Outputs
Inputs
Outputs
Synchronous Rectification Synchronous rectification is used to
reduce power dissipation in the external MOSFETs. As described
PWMH
PWML
PHASE
1
1
1
Phase A B
GHx H L
PWMH
PWML
PHASE
1
1
0
Phase A B
GHx L H
above, the A3941 can be instructed to turn on the appropriate
SR
1
GLx
L
H
SR
1
GLx
H
L
low-side and high-side driver during the load current recirculation
PWM off-cycle. During the decay time, synchronous rectifica-
tion allows current to flow through the selected MOSFET, rather
than through the source-drain body diode. The body diodes of the
recirculating power MOSFETs will conduct only during the dead
time that occurs at each PWM transition.
Dead Time
To prevent cross-conduction (shoot through) in any phase of
the power FET bridge, it is necessary to have a dead time delay,
t DEAD , between a high-side or low-side turn-off and the next
complementary turn-on event. The potential for cross-conduc-
tion occurs when any complementary high-side and low-side pair
of FETs are switched at the same time; for example, when using
(B) Fast decay, SR active, full four-quadrant control
Figure 2. Fast decay power bridge current paths
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
synchronous rectification or after a bootstrap capacitor charg-
ing cycle. In the A3941, the dead time for both phases is set by
a single dead-time resistor, R DEAD , between the RDEAD and
0
0
50
100
150
200 250 300
R DEAD (k Ω )
350
400
450
AGND pins.
Figure 3. Dead time versus R DEAD , (full range)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A3942 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Quad High-Side Gate Driver |
| A3942KLG-T | 制造商:Allegro MicroSystems LLC 功能描述:IC,Quad MOSFET Driver,TSSOP,38PIN,PLASTIC |
| A3942KLGTR-T | 功能描述:IC GATE DVR QUAD HISIDE 38-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
| A39438-000 | 制造商:TE Connectivity 功能描述:3012-11-230510-CS2324 |
| A3944 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive, Low-Side FET Pre-Driver |
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