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| 型号： | LT4356IMS-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC OVERVOLT PROT REG 10-MSOP |
| 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 |
| 电压 - 工作： | 4 ~ 80V |
| 电压 - 箝位： | 27V，可调 |
| 技术： | 混合技术 |
| 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 LT4356-3 DC1018B-B-ND - DEMO BOARD FOR LT4356-2 DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
LT4356-1/LT4356-2
APPLICATIONS INFORMATION
This ?xed early warning period allows the systems to per-
form necessary backup or house-keeping functions before
the power supply is cut off. After V TMR crosses the 1.35V
threshold, the pass transistor turns off immediately. Note
that during an overcurrent event, the timer current is not
reduced to 5μA after V TMR has reached 1.25V threshold,
since it would lengthen the overall fault timer period and
cause more stress on the power MOSFET.
As soon as the fault condition has disappeared, a 2μA
current starts to discharge the timer capacitor to ground.
When V TMR reaches the 0.5V threshold, the internal charge
pump starts to pull the GATE pin high, turning on the
MOSFET. The TMR pin is then actively regulated to 0.5V
until the next fault condition appears. The total cool down
timer period is given by:
voltage N-channel MOSFETs. For systems with V CC less
than 8V, a logic level MOSFET is required since the gate
drive can be as low as 4.5V.
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 drives a series
t COOL =
C TMR ? 0.85V
2μA
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 Selection
The LT4356 drives an N-channel MOSFET to conduct the
load current. The important features of the MOSFET are
on-resistance R DS(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 V CC
higher than 8V. This allows the use of standard threshold
V PK
τ
V IN
t r
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 speci?cations use the model shown
in Figure 3. The idealized waveform comprises a linear
ramp of rise time t r , reaching a peak voltage of V PK and
exponentially decaying back to V IN with a time constant
of t. A common automotive transient speci?cation has
constants of t r = 10μs, V PK = 80V and τ = 1ms. A surge
condition known as “load dump” has constants of t r =
5ms, V PK = 60V and τ = 200ms.
4356 F03
Figure 3. Prototypical Transient Waveform
4356fa
13
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相关代理商/技术参数 |
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|---|---|
| LT4356IMS-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Surge Stopper with Fault Latchoff |
| LT4356IMS-3#PBF | 功能描述:IC SURGE STOPPER W/LATCH 10MSOP 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 |
| LT4356IMS-3#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller IC |
| LT4356IMS-3#TRPBF | 功能描述:IC SURGE STOPPER ADJ 10-MSOP 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 |
| LT4356IMS-3PBF | 制造商:Linear Technology 功能描述:Surge Protection Adj Regulator 4-80V 7uA |
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