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LTC4251CS6 PDF预览

LTC4251CS6

更新时间： 2024-11-07 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
20页 232K
描述
Negative Voltage Hot Swap Controllers in SOT-23

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中文翻译

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LTC4251CS6 数据手册

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LTC4251/LTC4251-1/  
LTC4251-2  
Negative Voltage  
Hot Swap Controllers in SOT-23  
U
DESCRIPTIO  
FEATURES  
The LTC®4251/LTC4251-1/LTC4251-2 negative voltage  
Hot SwapTM controllers allow a board to be safely inserted  
and removed from a live backplane. Output current is  
controlled by three stages of current limiting: a timed  
circuitbreaker,activecurrentlimitingandafastfeedforward  
paththatlimitspeakcurrentunderworst-casecatastrophic  
fault conditions.  
■
Allows Safe Board Insertion and Removal from a  
Live –48V Backplane  
■
Floating Topology Permits Very High Voltage  
Operation  
■
Programmable Analog Current Limit with Circuit  
Breaker Timer  
■
Fast Response Time Limits Peak Fault Current  
■
Programmable Timer  
Programmable undervoltage and overvoltage detectors  
disconnect the load whenever the input supply exceeds  
the desired operating range. The supply input is shunt  
regulated, allowing safe operation with very high supply  
voltages. A multifunction timer delays initial start-up and  
controls the circuit breaker’s response time.  
■
Programmable Undervoltage/Overvoltage Protection  
Low Profile (1mm) ThinSOTTM Package  
■
U
APPLICATIO S  
■
Hot Board Insertion  
TheLTC4251UV/OVthresholdsaredesignedtomatchthe  
standard telecom operating range of –43V to –75V. The  
LTC4251-1 UV/OV thresholds extend the operating range  
toencompass–36Vto –72V. TheLTC4251-2implements  
a UV threshold of –43V only.  
■
Electronic Circuit Breaker  
■
–48V Distributed Power Systems  
■
Negative Power Supply Control  
■
Central Office Switching  
■
Programmable Current Limiting Circuit  
■
High Availability Servers  
Disk Arrays  
All parts are available in the 6-Pin SOT-23 package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
–48V, 2.5A Hot Swap Controller  
Start-Up Behavior  
GND  
R
*
IN  
+
GND  
10k  
C
L
GATE  
5V/DIV  
LOAD  
OUT  
(SHORT PIN)  
500mW  
100µF  
R1  
402k  
1%  
V
3
C
IN  
1µF  
V
IN  
5
4
6
1
Q1  
IRF530S  
SENSE  
2.5A/DIV  
UV/OV GATE  
LTC4251  
C1  
10nF  
3
TIMER SENSE  
1
R2  
32.4k  
1%  
R
C
R
V
S
EE  
V
10Ω  
OUT  
0.02Ω  
20V/DIV  
2
C
C
T
C
2
150nF  
18nF  
4
425112 TA01  
–48V  
425112 TA02  
*TWO 0.25W RESISTORS IN SERIES FOR  
ON THE PCB ARE RECOMMENDED.  
1ms/DIV  
R
IN  
425112fa  
1
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