参数资料
| 型号： | LTC4366HDDB-2#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | SURGE STOPPER SMD |
| 标准包装： | 500 |
| 电压 - 箝位： | 可调式 |
| 技术： | 混合技术 |
| 电路数： | 1 |
| 应用： | 自动 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
LTC4366-1/LTC4366-2
OPERATION
The Simplified Diagram shows three states of operation:
the start, run and regulate mode. Previous surge stopper
parts are powered off the input supply, therefore the surge
voltage is limited to the breakdown voltage of the input pins
of the part. As demonstrated in run and regulate modes,
the majority of this part is powered off the output, so the
MOSFET isolates the surge from the power pins of the
part. This allows surge voltages up to the breakdown of
the external MOSFET.
In the start mode a 15μA trickle current flows through R IN ,
half is used to charge the gate with the other half used as
bias current. As the GATE pin charges, the external MOSFET
brings up the OUT pin. This leads to the run mode where
the output is high enough to become a supply voltage for
the charge pump. The charge pump is then used to fully
charge the gate 12V above the source.
With the output voltage equal to the input voltage, it is
necessary to protect the load from an input supply over-
voltage. In the regulate mode, the overvoltage regulation
amplifier is referenced to the output through a 1.23V
reference. If the voltage drop across the upper feedback
resistor, R FB1 , exceeds 1.23V the regulation amplifier pulls
the gate down to regulate the R FB1 voltage back to 1.23V.
Therefore, the output voltage is clamped by setting the
proper ratio between R FB1 and R FB2 .
For example, if the output voltage is regulated at 100V then
the voltage drop across the R FB2 is 98.77V. If the Zener Z3
is 5.7V then the voltage drop across R SS is 94.3V. There-
fore, when the output is at a high voltage, the majority of
the voltage is dropped across the two resistors R FB2 and
R SS . This demonstrates how the LTC4366 floats up with
the supply. The adjustable 3-terminal regulators, such
as the LT ? 1085 and LM117, are also based on this idea.
The Functional Diagram shows the actual circuits. An
external R IN resistor on the V DD pin powers up the 12V
shunt regulator which then powers up logic supply, V CC .
After verifying that the shutdown input is not active, the
GATE pin is charged with a 7.5μA current from V DD . This
is the start mode.
Once the OUT to V SS voltage exceeds the 2.55V UVLO1
threshold, the overvoltage amplifier is enabled. Next, the
UVLO2 threshold of 4.75V is crossed and the charge pump
turns on. The charge pump charges the GATE pin with
20μA to its final value 12V above OUT (clamped by Z4).
This allows the capacitor between OUT and V SS to charge
until clamped by Z3 to 5.7V. In this run mode the MOSFET
is configured as a low resistance pass transistor with little
voltage drop and power dissipation in the MOSFET.
The powered up LTC4366 is now ready to protect the load
against an overvoltage transient. The overvoltage regula-
tion amplifier monitors the load voltage between OUT and
ground by sensing the voltage on the FB pin with respect
to the OUT pin (drop across R FB1 ). In an overvoltage
condition the OUT rises until the amplifier drives the M1
gate to regulate and limit the output voltage. This is the
regulate mode.
During regulation the excess voltage is dropped across the
MOSFET. To prevent overheating the MOSFET, the LTC4366
limits the overvoltage regulation time using the TIMER pin.
The TIMER pin is charged with 9μA until the pin exceeds
2.8V. At that point an overvoltage fault is set, the MOSFET
is turned off, and the part enters a cool-down period of
9 seconds. The logic and timer block are active during
cool down while the GATE pin is pulled to OUT.
The latched-off version, LTC4366-1, will remain in fault
until the SD pin is toggled low and then high. Once the fault
is cleared, the GATE is permitted to turn the MOSFET on
again. The auto-retry version, LTC4366-2, waits 9 seconds
then clears the fault and restarts.
10
For more information www.linear.com/LTC4366
436612fd
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4366HTS8-1#TRMPBF | 功能描述:IC SURGE STOPPER HV TSOT-23-8 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 |
| LTC4366HTS8-1#TRPBF | 功能描述:IC SURGE STOPPER HV TSOT-23-8 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 |
| LTC4366HTS8-2#PBF | 制造商:Linear Technology 功能描述:HIGH VOLTAGE SURGE STOPPER 4. 制造商:Linear Technology 功能描述:HIGH VOLTAGE SURGE STOPPER, 4.5-12.5V, TSOT-23-8; Controller Applications:Automotive, Avionic & Industrial Surge Protection, High Voltage DC Distribution; Internal Switch:No; Supply Voltage Min:4.5V; Supply Voltage Max:12.5V ;RoHS Compliant: Yes |
| LTC4366HTS8-2#TRMPBF | 功能描述:IC SURGE STOPPER HV TSOT-23-8 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 |
| LTC4366HTS8-2#TRPBF | 功能描述:IC SURGE STOPPER HV TSOT-23-8 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 |
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