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LTC4251BIS6#TRMPBF PDF预览

LTC4251BIS6#TRMPBF

更新时间： 2024-11-25 20:10:59
品牌 Logo 应用领域
凌特 - Linear /
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24页 207K
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LTC4251BIS6#TRMPBF 数据手册

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LTC4251B/LTC4251B-1/  
LTC4251B-2  
Negative Voltage  
Hot Swap Controllers in SOT-23  
FEATURES  
DESCRIPTION  
TheLTC®4251B/LTC4251B-1/LTC4251B-2negativevoltage  
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, activecurrentlimitingandafastfeedforwardpath  
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
Improved Ruggedness Shunt Regulator  
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 Timer  
n
Programmable Undervoltage/Overvoltage Protection  
n
Low Profile 6-Lead SOT-23 (ThinSOT™) Package  
APPLICATIONS  
The LTC4251B UV/OV thresholds are designed to match  
thestandardtelecomoperatingrangeof–43Vto–75V.The  
LTC4251B-1UV/OVthresholdsextendtheoperatingrange  
toencompass–36Vto–72V. TheLTC4251B-2implements  
a UV threshold of –43V only. The LTC4251B improves the  
ruggedness of the LTC4251 shunt regulator.  
n
Hot Board Insertion  
n
Electronic Circuit Breaker  
n
–48V Distributed Power Systems  
n
Negative Power Supply Control  
n
Central Office Switching  
n
Programmable Current Limiting Circuit  
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
High Availability Servers  
Disk Arrays  
n
TYPICAL APPLICATION  
–48V, 2.5A Hot Swap Controller  
Start-Up Behavior  
–48RTN  
R
*
IN  
+
–48RTN  
(SHORT PIN)  
10k  
GATE  
5V/DIV  
C
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  
LTC4251B  
C1  
10nF  
3
4
TIMER SENSE  
1
R2  
32.4k  
1%  
R
10Ω  
C
R
V
V
S
EE  
OUT  
0.02Ω  
20V/DIV  
C
C
C
T
2
18nF  
150nF  
4251b12 TA01a  
–48V  
4251b12 TA01b  
1ms/DIV  
*TWO 0.25W RESISTORS IN SERIES FOR  
R
ON THE PCB ARE RECOMMENDED.  
IN  
**DIODES, INC.  
†RECOMMENDED FOR HARSH ENVIRONMENTS  
4251b12f  
1
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