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参数资料
| 型号： | A3944KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 22/31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 maximum repetition rate of this pulse is derived from the
Substituting into equation 4:
maximum average clamp power dissipation limit. The minimum
time between pulses, t REP , is:
I DRNC =
10 μ J
54 V × 10 μ s
= 18.5 mA
E DRNC
t REP = P DRNC
(3)
As given in equation 1, the value of the drain resistor is the volt-
age across the resistor divided by the maximum current:
t REP = = 48.6 μ s
where P DRNC is theA3944 drain clamp maximum power.
Substituting into equation 3:
4.86 μ J
100 mW
resulting in a repetition rate of just over 20 kHz.
R Dx =
R Dx =
V FET – V DCL
I DRNC
80 V – 54 V
18.5 mA
= 1.4 k Ω
Maximum energy example:
? Load resistance: 18 Ω
? Load inductance: 1 mH
? Load current: 0.72 A
? Load supply voltage: 13 V
As given in equation 3, the maximum repetition rate of this pulse
is derived from the maximum average clamp power dissipation
limit as:
E DRNC
t REP = P DRNC
? FET clamp voltage: 80 V
These values would typically apply to a small inductive load
such as a solenoid or relay. When the load is switched off, the
inductance attempts to keep the current flowing by increasing
the voltage at the end connected to the FET switch. This voltage
10 μ J
t REP = = 100 μ s
100 mW
resulting in a repetition rate of 10 kHz.
:
increases up to the breakdown voltage of the FET. At that point,
the voltage across the load amounts to the difference between
the FET breakdown voltage and the supply voltage, and it acts to
reduce the current. With the parameters in this example, the cur-
rent would decay to zero in about 10 μ s. This is greater than the
1.85 μ s pulse time defining the maximum current but less than
the 2 ms time constant for maximum average clamp power, so
the drain resistor will be selected to limit the energy injected into
the drain clamp in the A3944. The maximum current, the A3944
drain clamp maximum current, I DRNC , will be:
Maximum power example:
? Load resistance: 5 Ω
? Load inductance: 80 mH
? Load current: 2.6 A
? Load supply voltage: 13 V
? FET clamp voltage: 60 V
These values would typically apply to a large inductive load
such as a coil or actuator. When the load is switched off, the
inductance attempts to keep the current flowing by increasing
I DRNC =
E DRNC
V DCL × t PULSE
(4)
the voltage at the end connected to the FET switch. This voltage
increases up to the breakdown voltage of the FET. At that point,
the voltage across the load amounts to the difference between
where
E DRNC is the A3944 drain clamp maximum energy,
V DCL is the A3944 drain clamp voltage, and
t PULSE is the duration of the current pulse.
the FET breakdown voltage and the supply voltage, and it acts
to reduce the current. With the parameters in this example, the
current would decay to zero in about 4 ms. This is greater than
the 2 ms time constant for maximum average clamp power, so
the drain resistor will be selected to limit the power dissipated by
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
22
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相关代理商/技术参数 |
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|---|---|
| A3946 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Half-Bridge Power MOSFET Controller |
| A3946GLPTR-T | 制造商:Allegro MicroSystems LLC 功能描述: |
| 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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