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| 型号： | A3944KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 27/31页 |
| 文件大小： | 0K |
| 描述： | IC PREDRIVER MOSFET 6CH TSSOP |
| 标准包装： | 8,000 |
| 配置： | 低端 |
| 输入类型： | 并行/串行 |
| 延迟时间： | 200ns |
| 电流 - 峰： | 50mA |
| 配置数： | 6 |
| 输出数： | 6 |
| 电源电压： | 6 V ~ 40 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： | 带卷 (TR) |
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A3944
Automotive, Low Side FET Pre-Driver
The variation of R SBmax with load voltage is shown as the lower
line (Maximum Short Resistance) in figure 18.This example
shows the maximum possible resistance of a short to battery
that will always be detected as a short with a 2.8 Ω load and a
100 m Ω MOSFET using short to battery threshold level 5.
This allows a lower threshold to be used for V STB , resulting in a
faster short to battery detection and a lower short circuit current.
Minimum load resistance
For normal operation:
R L R SB
R L + R SB
As R L increases, R SB becomes the dominant resistance and:
V L R ON
V D =
+ R ON
and:
V DRNx =
V L R ON
R L + R ON
(20)
V D =
V L R ON
R SB + R ON
(18)
Rearranging gives:
V DRNx < V STB
( V L – V STB ) R ON
The expression for R SB (from equation 15) becomes:
( V L – V STB ) R ON
R SB <
V STB
(19)
R L > (21)
V STB
The minimum value of the load resistance, R L , that will not cause
a short to battery detection under normal operating conditions is
given by:
R Lmin =
( V Lmax – V STBmin ) R ONmax
V STBmin
(22)
The variation of R Lmin with load voltage is shown as the upper
line (Minimum Load Resistance) in figure 18. This example
shows the minimum possible load resistance that will always
allow a short to battery to be detected with a 0.5 Ω short and a
100 m Ω MOSFET using short to battery threshold level 5.
Power Dissipation Estimation
The A3944 supply currents have very little dependency on the
state of the internal circuits. In addition, the internal operation
is essentially low speed so the power dissipation has almost no
dependency on operating frequency other than dissipation due
to channel switching and diagnostics that are proportional to
PWM frequency. It is therefore possible to estimate the maximum
power dissipated within the A3944 by summing the contribution
from the three quiescent supply currents with the dissipation due
to channel switching and diagnostics associated with turning each
Figure 18. Short to battery detection limits
external MOSFET on and off.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
27
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| A3946KLB-T | 功能描述:IC MOSFET CONTROLLER 16-SOIC 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3946KLBTR | 功能描述:IC CTRLR MOSFET 16-SOIC RoHS:否 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
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