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| 型号： | A3941KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/21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
Functional Description
The A3941 is a full-bridge MOSFET driver (pre-driver) requiring
a single unregulated supply of 7 to 50 V. It includes an integrated
5 V logic supply regulator.
The four high current gate drives are capable of driving a wide
range of N-channel power MOSFETs, and are configured as two
high-side drives and two low-side drives. The A3941 provides
all the necessary circuits to ensure that the gate-source voltage
of both high-side and low-side external FETs are above 10 V, at
supply voltages down to 7 V. For extreme battery voltage drop
conditions, correct functional operation is guaranteed at supply
voltages down to 5.5 V, but with a reduced gate drive voltage.
The A3941 can be driven with a single PWM input from a
microcontroller and can be configured for fast or slow decay.
Fast decay can provide four-quadrant motor control, while slow
decay is suitable for two-quadrant motor control or simple induc-
tive loads. In slow decay, current recirculation can be through
the high-side or the low-side MOSFETs. In either case, bridge
efficiency can be enhanced by synchronous rectification. Cross-
conduction (shoot through) in the external bridge is avoided by
an adjustable dead time.
A low power sleep mode allows the A3941, the power bridge, and
the load to remain connected to a vehicle battery supply without
the need for an additional supply switch.
The A3941 includes a number of protection features against
undervoltage, overtemperature, and power bridge faults. Fault
states enable responses by the device or by the external control-
ler, depending on the fault condition and logic settings. Two fault
flag outputs, FF1 and FF2, are provided to signal detected faults
to an external controller.
Power Supplies
A single power supply connection is required to the VBB pin
through a reverse voltage protection circuit. The supply should be
decoupled with a ceramic capacitor connected close to the VBB
and ground pins.
The A3941 operates within specified parameters with a VBB
supply from 7 to 50 V and functions correctly with a supply down
to 5.5 V. This provides a very rugged solution for use in the harsh
automotive environment.
V5 Pin A 5 V low current supply for external pullup resistors is
provided by an integrated 5 V regulator. This regulator is also
used by the internal logic circuits and must always be decoupled
by at least a 100 nF capacitor between the V5 pin and GND. The
5 V regulator is disabled when RESET is held low.
Gate Drives
The A3941 is designed to drive external, low on-resistance,
power N-channel MOSFETs. It supplies the large transient cur-
rents necessary to quickly charge and discharge the external FET
gate capacitance in order to reduce dissipation in the external
FET during switching. The charge and discharge rate can be
controlled using an external resistor in series with the connection
to the gate of the FET.
Gate Drive Voltage Regulation The gate drives are powered by
an internal regulator which limits the supply to the drives and
therefore the maximum gate voltage. When the V BB supply is
greater than about 16 V, the regulator is a simple linear regulator.
Below 16 V, the regulated supply is maintained by a charge pump
boost converter, which requires a pump capacitor connected
between the CP1 and CP2 pins. This capacitor must have a mini-
mum value of 220 nF, and is typically 470 nF.
The regulated voltage, nominally 13 V, is available on the VREG
pin. A sufficiently large storage capacitor must be connected to
this pin to provide the transient charging current to the low-side
drives and the bootstrap capacitors.
Top-off Charge Pump An additional top-off charge pump is
provided for each phase. The charge pumps allow the high-side
drives to maintain the gate voltage on the external FETs indefi-
nitely, ensuring so-called 100% PWM if required. This is a low
current trickle charge pump, and is operated only after a high-side
FET has been signaled to turn on. The floating high-side gate
drive requires a small bias current (<20 μ A) to maintain the high-
level output. Without the top-off charge pump, this bias current
would be drawn from the bootstrap capacitor through the Cx pin.
The charge pump provides sufficient current to ensure that the
bootstrap voltage and thereby the gate-source voltage is main-
tained at the necessary level.
Note that the charge required for initial turn-on of the high-side
gate is always supplied by the bootstrap capacitor. If the bootstrap
capacitor becomes discharged, the top-off charge pump will not
provide sufficient current to allow the FET to turn on.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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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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