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参数资料
| 型号： | LTC4366IDDB-1#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC SURGE STOPPER HV 8-DFN |
| 标准包装： | 1 |
| 电压 - 工作： | 9V |
| 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： | 标准包装 |
| 其它名称： | LTC4366IDDB-1#TRMPBFDKR |
LTC4366-1/LTC4366-2
APPLICATIONS INFORMATION
The typical LTC4366 application is a protected system
that distributes power to loads safe from overvoltage
transients. External component selection is discussed in
the following sections.
Dual Shunt Regulators
The LTC4366 uses two shunt regulators coupled with
the external voltage dropping resistors, R SS and R IN , to
generate internal supply rails at the V DD and OUT pins.
These shunt-regulated rails allow overvoltage protection
from unlimited high voltage transients irrespective of the
voltage rating of the LTC4366’s internal circuitry.
At the beginning of start-up, during shutdown, or after an
overvoltage fault, the GATE pin is clamped to the OUT pin
thereby shutting off the MOSFET. This allows the V SS and
OUT pins to be pulled to ground by output load and R SS .
Under this condition the V DD pin is clamped with a 12V
shunt regulator to V SS . The full supply voltage minus 12V
is then impressed on the R IN resistor which sets the shunt
current. The shunt current can be as high as 10mA which
is several orders of magnitude higher than the typical 9μA
V DD pin quiescent current.
In normal operation the OUT voltage is equal to the input
supply. With C1 fully charged I C1 is zero at this point. Under
this condition the voltage between the OUT and V SS pins
are clamped with a 5.7V shunt regulator. The input supply
M1
V IN FQA62N25C V OUT
28V 1.5A
(18V DC TO 250V DC) (43V CLAMP)
voltage minus 5.7V is impressed on R SS . The R SS current
is divided into three areas: the 5.7V shunt current, bias
current between OUT and V SS and finally the R IN current.
The 5.7V shunt current can be as high as 10mA which
greatly exceeds the typical OUT (160μA) bias current.
Turn-On Sequence
The voltage between the V DD and V SS pins is shunt regu-
lated to 12V after ramping up the input supply. Next, the
internally generated supply, V CC , produces a 30μs power-
on-reset pulse which clears the fault latch and initializes
internal latches. Next, the shutdown comparator determines
if the SD pin is externally pulled low, thereby requesting a
low bias current shutdown state. Otherwise the external
MOSFET, M1, is allowed to turn on.
Turning on the 7.5μA GATE pull-up current source from the
V DD pin begins what can be described as a “bootstrapped”
method for powering up the MOSFET gate. Once the GATE
reaches the V DD pin voltage (minus a Schottky diode), the
7.5μA source loses voltage headroom and stops charging
the GATE (middle of waveforms in Figure 2.). The bootstrap
method relies on charging C1 to a sufficient voltage after
GATE stops increasing. The voltage on C1 is then used as
a supply for a charge pump that charges the gate to its
final value 12V above OUT. C1 will discharge if the charge
pump current exceeds the C1 charging current. If the
voltage drops below 4.35V, the charge pump will pause
allowing C1 to recharge.
R G
10
SD
R2
100k
R1
470k
Q1
MMBT3904
R IN
324k
V DD GATE
SD LTC4366-2
TIMER V SS
C T
10nF
C G
10nF
R SS
46.4k
OUT
FB
BASE
R FB1
12.4k
R FB2
422k
436612 F01
C1
0.47μF
V GATE
10V/DIV
V OUT
10V/DIV
V C1
5V/DIV
CHARGE
PUMP PAUSE
C1 RECHARGING
CHARGE
PUMP STARTS
C1 CHARGING
11
Figure 1. Typical Application
For more information www.linear.com/LTC4366
20ms/DIV
Figure 2. Turn-On Waveforms
436612 TA01b
436612fd
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4366IDDB-2#PBF | 制造商:Linear Technology 功能描述:IC SURGE STOPPER 500 V DFN-8 制造商:Linear Technology 功能描述:IC, SURGE STOPPER, 500 V, DFN-8 制造商:Linear Technology 功能描述:IC, SURGE STOPPER, 500 V, DFN-8; Controller Applications:Automotive, Industrial Automation, Laptops, Portable Instrumentation; Internal Switch:Yes; Supply Voltage Min:4.5V; Supply Voltage Max:12V; Digital IC Case Style:DFN ;RoHS Compliant: Yes |
| LTC4366IDDB-2#TRMPBF | 功能描述:IC SURGE STOPPER HV 8-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 |
| LTC4366IDDB-2#TRPBF | 功能描述:IC SURGE STOPPER HV 8-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 |
| LTC4366ITS8-1#PBF | 制造商:Linear Technology 功能描述:IC SURGE STOPPER 500 V 8-SOT-23 制造商:Linear Technology 功能描述:IC, SURGE STOPPER, 500 V, 8-SOT-23 制造商:Linear Technology 功能描述:IC, SURGE STOPPER, 500 V, 8-SOT-23; Controller Applications:Automotive, Industrial Automation, Laptops, Portable Instrumentation; Internal Switch:Yes; Supply Voltage Min:4.5V; Supply Voltage Max:12.5V; Digital IC Case Style:TSOT-23 ;RoHS Compliant: Yes |
| LTC4366ITS8-1#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 |
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