- 您现在的位置：买卖IC网 > Datasheet目录306 > A3941KLPTR-T (Allegro Microsystems Inc)IC MOSFET FULL BRDG AUTO 28TSSOP Datasheet资料下载
参数资料
| 型号： | A3941KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/21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
Applications Information
Power Bridge Management Using PWM Control
The A3941 provides two PWM control signals, a phase control
for current direction, and the ability to enable or disable syn-
chronous rectification. This allows a wide variety of full bridge
control schemes to be implemented. The six basic schemes are
GHA
GLA
LOAD
GHB
GLB
GHA
GLA
LOAD
GHB
GLB
shown in table 2 and described further below.
Driving
Recirculating
Slow Decay Slow decay is the simplest and most common
Inputs
Outputs
Inputs
Outputs
control configuration. Figure 1A shows the path of the bridge
and load current when a PWM signal is applied to PWMH, with
PWML and PHASE tied high, and SR low.
PWMH
PWML
PHASE
SR
1
1
1
0
Phase A B
GHx H L
GLx L H
PWMH
PWML
PHASE
SR
0
1
1
0
Phase A B
GHx H L
GLx L H
In this case the high-side MOSFETs are switched off during the
current decay time (PWM off-time) and load current recirculates
through the low-side MOSFETs. This is commonly referred to as
high-side chopping or high-side PWM. The recirculating current
flows through the body diode of the low-side MOSFET, which
(A) Slow decay, diode recirculation, high-side PWM
is complementary to the high-side MOSFET being switched off.
Improved efficiency can be achieved by turning on the comple-
mentary MOSFETs during the PWM off-time to short the reverse
diode and provide synchronous rectification. This can be easily
GHA
GLA
LOAD
GHB
GLB
GHA
GLA
LOAD
GHB
GLB
achieved by taking SR high as shown in figure 1B.
GHx
1
GHx
PHASE
1
By applying the PWM signal to the PWML pin instead of the
PWMH pin, the low-side MOSFET is turned off during the PWM
off-time and the load current recirculates through the high-side
MOSFETs as in figure 1C.
Inputs
PWMH
PWML
PHASE
SR
Driving
Outputs
1 Phase A B
1
H L
1 GLx L H
Recirculating
Inputs Outputs
PWMH 0 Phase A B
PWML 1
L L
SR 1 GLx H H
In the three slow decay configurations shown, the direction of the
average current in the load can be reversed by simply applying a
low level to the PHASE pin. Referring to the slow decay entries
in table 2, when PHASE is high the average current flows from
the phase A connection (SA) to the phase B connection (SB).
When PHASE is low the direction is from B to A.
(B) Slow decay, SR active, high-side PWM
Fast Decay While slow decay usually provides sufficient control
over the load current for most simple control systems, it is pos-
sible that current control stability can be affected by, for example,
the back EMF of the load. In these cases, typically actuator posi-
GHA
GLA
LOAD
GHB
GLB
GHA
GLA
LOAD
GHB
GLB
GHx
1
GHx
PHASE
1
tioning or servo control systems, it may be necessary to use fast
decay to provide continuous control over the load current. The
A3941 can be configured to provide fast decay using either diode
recirculation or synchronous rectification.
Fast decay with diode recirculation is achieved by applying a
Inputs
PWMH
PWML
PHASE
SR
Driving
Outputs
1 Phase A B
1
H L
1 GLx L H
Recirculating
Inputs Outputs
PWMH 1 Phase A B
PWML 0
H H
SR 1 GLx L L
PWM signal at the same time to both PWM inputs, PWMH and
PWML, with SR disabled (figure 2A). Because current recircu-
lation is through the body diodes of the MOSFETs, the aver-
age load current cannot be negative so, as for the slow decay
(C) Slow decay, SR active, low-side PWM
Figure 1. Slow decay power bridge current paths
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
相关PDF资料 |
PDF描述 |
|---|---|
| A3942KLGTR-T | IC GATE DVR QUAD HISIDE 38-TSSOP |
| A3944KLPTR-T | IC PREDRIVER MOSFET 6CH TSSOP |
| A3985SLDTR-T | IC MOSFET DRVR PROG DUAL 38TSSOP |
| A4933KJPTR-T | IC PREDRIVER MOSFET 3PH 48LQFP |
| A4935KJPTR-T | IC MOSFET DVR AUTO 3PH 48-LQFP |
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 |
发布紧急采购，3分钟左右您将得到回复。