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LTC4211_12

更新时间： 2024-09-24 11:45:11
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
40页 312K
描述
Hot Swap Controller

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中文翻译

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LTC4211_12 数据手册

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LTC4211  
Hot Swap Controller with  
Multifunction Current Control  
FEATURES  
DESCRIPTION  
TheLTC®4211isaHotSwap™controllerthatallowsaboard  
to be safely inserted and removed from a live backplane.  
An internal high side switch driver controls the gate of an  
external N-channel MOSFET for supply voltages ranging  
from 2.5V to 16.5V. The LTC4211 provides soft-start and  
inrush current limiting during the start-up period which  
has a programmable duration.  
n
Allows Safe Board Insertion and Removal  
from a Live Backplane  
n
Controls Supply Voltages from 2.5V to 16.5V  
n
Programmable Soft-Start with Inrush Current  
Limiting, No External Gate Capacitor Required  
n
Faster Turn-Off Time Because No External Gate  
Capacitor is Required  
n
Dual Level Overcurrent Fault Protection  
Two on-chip current limit comparators provide dual level  
overcurrent circuit breaker protection. The slow com-  
parator trips at VCC – 50mV and activates in 20μs (or is  
programmed by an external filter capacitor, MS only).  
The fast comparator trips at VCC – 150mV and typically  
responds in 300ns.  
n
Programmable Response Time for Overcurrent  
Protection (MS)  
n
Programmable Overvoltage Protection (MS)  
n
Automatic Retry or Latched Mode Operation (MS)  
n
High Side Drive for an External N-Channel FET  
n
User-Programmable Supply Voltage Power-Up Rate  
n
TheFBpinmonitorstheoutputsupplyvoltageandsignals  
the RESET output pin. The ON pin signal turns the chip on  
and off and can also be used for the reset function. The  
MS package has FAULT and FILTER pins to provide addi-  
tional functions like fault indication, autoretry or latch-off  
modes, programmable current limit response time and  
programmable overvoltage protection using an external  
Zener diode clamp.  
FB Pin Monitors V  
and Signals RESET  
OUT  
n
Glitch Filter Protects Against Spurious RESET Signal  
APPLICATIONS  
n
Electronic Circuit Breaker  
n
Hot Board Insertion and Removal (Either On  
Backplane or On Removable Card)  
Industrial High Side Switch/Circuit Breaker  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap  
is a trademark of Linear Technology Corporation. All other trademarks are the property of their  
respective owners.  
n
TYPICAL APPLICATION  
Single Channel 5V Hot Swap Controller  
Power-Up Sequence  
BACKPLANE PCB EDGE  
CONNECTOR CONNECTOR  
NO C  
LOAD  
(FEMALE)  
(MALE)  
R
M1  
SENSE  
0.007Ω  
V
5V  
5A  
V
GATE  
Si4410DY  
OUT  
LONG  
V
CC  
5V/DIV  
5V  
+
R
X
C
LOAD  
10Ω  
Z1*  
V
C
X
100nF  
RESET  
5V/DIV  
8
7
6
R5  
R3  
36k  
10k  
V
SENSE  
GATE  
FB  
CC  
5
1
R1  
20k  
V
ON  
R4  
15k  
1V/DIV  
SHORT  
2
μP  
LTC4211  
ON  
LOGIC  
V
R2  
10k  
TIMER  
RESET  
1V/DIV  
RESET  
TIMER  
3
GND  
2.5ms/DIV  
4211 TA01b  
4
PCB CONNECTION SENSE  
LONG  
C
TIMER  
10nF  
GND  
GND  
4211 TA01A  
Z1 = 1SMA10A OR SMAJ10A  
* OPTIONAL  
4211fb  
1
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