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| 型号： | A3944KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 26/31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
Practical Short to Battery Limits
Automotive, Low Side FET Pre-Driver
This will be at a minimum when
A short to battery is detected, when the external FET is on, if the
voltage at the DRNx terminal is greater than the short to battery
threshold, V STB . Under ideal conditions a short circuit would be
zero resistance. However in practical systems the short will have
a finite resistance. The equivalent circuit during a short to battery
is shown in figure 17.
The voltage at the DRNx terminal in the on-state when a short to
battery is present is defined as:
( V L – V STB )
V STB R L – ( V L – V STB ) R ON
is at its minimum. This occurs when V L –V STB is at its minimum
and V STB is at its maximum. This is the condition that is present
when V L is just high enough to provide the minimum drop-out
voltage above the maximum value of V REG , (that is, when V L =
V REGmax + V DOmin ) and V STB is at the maximum tolerance value.
R L + R SB
V DRNx =
V L R ON
R L R SB
+ R ON
(13)
Placing these limits into the expression for R SB gives the expres-
sion for the minimum short resistance, defined by:
where
V DRNx is the voltage at the DRNx terminal,
R SBmax(min) =
( V REGmax + V DOmin + V STBmax ) R ON R L
V STBmax ( R L + R ON ) – ( V REGmax + V DOmin ) R ON
(16)
V L is the load supply voltage,
R ON is the FET switch on-resistance,
The maximum short resistance at any load voltage is given by:
R L is the load resistance, and
R SB is the resistance of the short across the load.
A short to ground is detected when:
R SBmax =
( V L – V STBmax ) R ON R L
V STBmax ( R L + R ON ) – V L R ON
(17)
V DRNx > V STB
R L + R SB
whereV STB is the short to ground detect voltage, then:a
V L R ON
> V STB
R L R SB
+ R ON
(14)
R SB
V L
R L
For short to battery diagnostics there are two limiting resistance
values to consider. The first is the maximum value of R SB that
will always cause a short to be detected. The second is the mini-
mum value of R L that will not cause a short to battery detection
under normal operating conditions.
+
-
V STB
DRNx
R ON
Maximum short resistance
The maximum value of the short resistance, R SB , that will always
cause a short to be detected is given by the minimum value of
R SB that satisfies the short detection criterion defined by:
R SB <
( V L – V STB ) R ON R L
V STB ( R L + R ON ) – V L R ON
(15)
Figure 17. Short to battery detection condition
Allegro MicroSystems, LLC
115 Northeast Cutoff
26
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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| A3946KLB | 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 |
| 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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