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LTC4251_12

更新时间： 2024-11-25 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
24页 262K
描述
Negative Voltage Hot Swap Controllers in SOT-23

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中文翻译

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LTC4251_12 数据手册

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LTC4251/LTC4251-1/  
LTC4251-2  
Negative Voltage  
Hot Swap Controllers in SOT-23  
NOT RECOMMENDED FOR NEW DESIGNS  
Please See LTC4251B for Drop-In Replacement  
FeaTures  
DescripTion  
The LTC®4251/LTC4251-1/LTC4251-2 negative voltage  
Hot Swap™ controllers allow a board to be safely inserted  
and removed from a live backplane. Output current is con-  
trolled by three stages of current limiting: a timed circuit  
breaker, active current limitinganda fastfeedforwardpath  
that limits peak current under worst-case catastrophic  
fault conditions.  
n
Allows Safe Board Insertion and Removal from a  
Live –48V Backplane  
n
Floating Topology Permits Very High Voltage  
Operation  
n
Programmable Analog Current Limit with Circuit  
Breaker Timer  
n
Fast Response Time Limits Peak Fault Current  
n
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.  
n
Programmable Undervoltage/Overvoltage Protection  
n
Low Profile (1mm) ThinSOT™ Package  
applicaTions  
n
Hot Board Insertion  
The LTC4251 UV/OV thresholds are designed to match the  
standard telecom operating range of –43V to –75V. The  
LTC4251-1 UV/OV thresholds extend the operating range  
to encompass –36V to –72V. The LTC4251-2 implements  
a UV threshold of –43V only.  
n
Electronic Circuit Breaker  
n
–48V Distributed Power Systems  
n
Negative Power Supply Control  
n
Central Office Switching  
n
Programmable Current Limiting Circuit  
n
High Availability Servers  
Disk Arrays  
All parts are available in the 6-Pin SOT-23 package.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks  
are the property of their respective owners.  
n
Typical applicaTion  
–48V, 2.5A Hot Swap Controller  
Start-Up Behavior  
–48RTN  
R
*
IN  
+
–48RTN  
(SHORT PIN)  
10k  
C
GATE  
5V/DIV  
L
LOAD  
500mW  
100µF  
R1  
402k  
1%  
V
OUT  
†
C
D
IN  
IN  
V
IN  
1µF  
DDZ13B**  
Q1  
IRF530S  
SENSE  
2.5A/DIV  
UV/OV GATE  
LTC4251  
C1  
10nF  
3
4
TIMER SENSE  
1
R2  
32.4k  
1%  
R
10Ω  
C
R
V
S
EE  
V
OUT  
0.02Ω  
20V/DIV  
C
C
C
T
2
18nF  
150nF  
425112 TA01  
–48V  
425112 TA02  
1ms/DIV  
*TWO 0.25W RESISTORS IN SERIES FOR  
R
ON THE PCB ARE RECOMMENDED.  
IN  
**DIODES, INC.  
†RECOMMENDED FOR HARSH ENVIRONMENTS  
425112fc  
1
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