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| 型号： | LT4356IDE-3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO12 |
| 封装： | 4 X 3 MM, PLASTIC, M0-229WGED, DFN-12 |
| 文件页数： | 4/24页 |
| 文件大小： | 231K |
| 代理商： | LT4356IDE-3 |
LT4356-3
12
43563fa
The SOA of the MOSFET must encompass all fault condi-
tions. In normal operation the pass transistor is fully on,
dissipating very little power. But during either overvoltage
or overcurrent faults, the GATE pin is servoed to regu-
late either the output voltage or the current through the
MOSFET. Large current and high voltage drop across the
MOSFET can coexist in these cases. The SOA curves of
the MOSFET must be considered carefully along with the
selection of the fault timer capacitor.
Transient Stress in the MOSFET
During an overvoltage event, the LT4356-3 drives a series
pass MOSFET to regulate the output voltage at an acceptable
level. The load circuitry may continue operating throughout
this interval, but only at the expense of dissipation in the
MOSFET pass device. MOSFET dissipation or stress is a
function of the input voltage waveform, regulation voltage
and load current. The MOSFET must be sized to survive
this stress.
Most transient event specications use the model shown
in Figure 3. The idealized waveform comprises a linear
ramp of rise time tr, reaching a peak voltage of VPK and
exponentially decaying back to VIN with a time constant
of t. A common automotive transient specication has
constants of tr = 10μs, VPK = 80V and τ = 1ms. A surge
condition known as “load dump” has constants of tr = 5ms,
VPK = 60V and τ = 200ms.
This xed early warning period allows time for the system
to perform necessary backup or house-keeping functions
before power is cut off. When VTMR crosses the 1.35V
threshold, the GATE pin pulls low immediately and turns
off the MOSFET. Note that during an overcurrent event the
timer current is not reduced to 5μA when VTMR reaches
1.25V, since it would lengthen the overall fault timer period
and cause additional MOSFET stress. After the GATE pin
pulls low due to a fault time out, the LT4356-3 latches off.
Allow sufcient time for the TMR pin to discharge to 0.5V
(typical discharge current is 2.2μA) and for the MOSFET
to cool before attempting to reset the part. To reset, pull
the SHDN pin low for at least 100μs, then pull high with
a slew rate of at least 10V/ms.
MOSFET Selection
The LT4356-3 drives an N-channel MOSFET to conduct the
load current. The important features of the MOSFET are
on-resistance RDS(ON), the maximum drain-source voltage
V(BR)DSS, the threshold voltage, and the SOA.
The maximum allowable drain-source voltage must be
higher than the supply voltage. If the output is shorted
to ground or during an overvoltage event, the full supply
voltage will appear across the MOSFET.
The gate drive for the MOSFET is guaranteed to be more
than 10V and less than 16V for those applications with VCC
higher than 8V. This allows the use of standard threshold
voltage N-channel MOSFETs. For systems with VCC less
than 8V, a logic level MOSFET is required since the gate
drive can be as low as 4.5V.
APPLICATIONS INFORMATION
Figure 3. Prototypical Transient Waveform
VPK
VIN
43563 F03
tr
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT4356IDE-3#PBF | 功能描述:IC SURGE STOPPER W/LATCH 12-DFN RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356IDE-3#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller IC |
| LT4356IDE-3#TRPBF | 功能描述:IC SURGE STOPPER ADJ 12-DFN RoHS:是 类别:过电压，电流，温度装置 >> 电涌抑制 IC 系列:- 产品培训模块:LT4356 Surge Stopper 产品目录绘图:LT4356 Output Graph LT4356 Series 10-MSOP 标准包装:2,500 系列:- 电压 - 工作:4 ~ 80V 电压 - 箝位:27V，可调 技术:混合技术 功率（瓦特）:- 电路数:1 应用:自动 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:带卷 (TR) 配用:DC1018B-C-ND - DEMO BOARD FOR LT4356-3DC1018B-B-ND - DEMO BOARD FOR LT4356-2DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
| LT4356IDE-3PBF | 制造商:Linear Technology 功能描述:Surge Protection Adj Regulator 4-80V 7uA |
| LT4356IDE-3TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
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