参数资料
| 型号： | LT4351IMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC CTLR MOSFET DIODE-OR 10MSOP |
| 标准包装： | 50 |
| 应用： | 并行/冗余电源 |
| FET 型： | N 沟道 |
| 输出数： | 1 |
| 内部开关： | 无 |
| 延迟时间 - 关闭： | 600ns |
| 电源电压： | 1.2 V ~ 18 V |
| 电流 - 电源： | 1.4mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
LT4351
APPLICATIONS INFORMATION
R DS <
for two MOSFETs and
R DS <
for a single MOSFET
Thegatedriveamplifierwillattempttoregulatethevoltage
across the MOSFETs to 15mV. Regulation will be achieved if:
15mV
2 ? I LOAD
15mV
I LOAD
This requires very low R DS values. This may be achieved
by paralleling MOSFETs, but be careful to keep intercon-
nection trace resistance low. In the event that regulation
cannot be achieved, the gate drive amplifier will drive GATE
to its clamp and achieve the best R DS possible at that level.
STATUS
at the load and provides for a more accurate transition
from supply to supply and more accurate load sharing
between supplies.
ORing can be done either at the load or at the source.
Figure 9 shows some examples. ORing at the load is usu-
ally the safest method since it protects against shorts in
interconnects.
The LT4351 tighter forward-voltage tolerance makes it
easier to balance current between similar supplies using
the droop method. The droop method uses the supply
voltage and series resistance in the power path to provide
load sharing. In this case, size the MOSFET’s R DS(ON) low
to allow for regulation.
The STATUS pin sinks current when the input (V IN ) is
above output (OUT) by 15mV and GATE is above V IN by
0.7V. This will normally indicate that power is being passed
though the MOSFETs.
In the event of a nonfunctional MOSFET, the GATE voltage
will be driven high (to the GATE clamp voltage). If V IN is
greater than OUT by more than 0.21V, the FAULT pin will
sink current to signal the potential problem.
There is no direct measurement or confirmation of cur-
rent flowing in the MOSFETs. Current is shared between
sources based on their voltage and series resistance. If
precision load sharing is desired, the LTC4350 may be a
more suitable part.
BACKPLANE
SOURCE 1
SOURCE 2
BACKPLANE
SOURCE 1
LT4351
LT4351
LT4351
LT4351
BOARD
LOAD
BOARD
LOAD
Redundant Supplies
The LT4351 is an improved solution for ORing redundant
supplies because of its lower forward drop versus con-
ventional diodes. The lower forward drop significantly
improves overall efficiency, improves the voltage tolerance
SOURCE 2
4351 F09
Figure 9. Redundant Backplane Supplies
4351fd
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4352 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Surge |
| LT4356 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Surge |
| LT4356-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Overvoltage Protection Regulator and Inrush Limiter |
| LT4356-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Ideal Diode n Adjustable Output Clamp Voltage |
| LT4356-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
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