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LTC4252A-1_15

更新时间： 2024-11-08 01:08:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
36页 334K
描述
Negative Voltage Hot Swap Controllers

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中文翻译

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LTC4252A-1_15 数据手册

 浏览型号LTC4252A-1_15的Datasheet PDF文件第2页浏览型号LTC4252A-1_15的Datasheet PDF文件第3页浏览型号LTC4252A-1_15的Datasheet PDF文件第4页浏览型号LTC4252A-1_15的Datasheet PDF文件第5页浏览型号LTC4252A-1_15的Datasheet PDF文件第6页浏览型号LTC4252A-1_15的Datasheet PDF文件第7页 
LTC4252-1/LTC4252-2  
LTC4252A-1/LTC4252A-2  
Negative Voltage  
Hot Swap Controllers  
FeaTures  
DescripTion  
The LTC®4252 negative voltage Hot SwapTM controller  
allows a board to be safely inserted and removed from a  
livebackplane.Outputcurrentiscontrolledbythreestages  
of current limiting: a timed circuit breaker, active current  
limitingandafastfeedforwardpaththatlimitspeakcurrent  
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
Current Limit With Circuit Breaker Timer  
n
Fast Response Time Limits Peak Fault Current  
n
Programmable Soft-Start Current Limit  
n
Programmable Timer with Drain Voltage  
Adjustable undervoltage and overvoltage detectors dis-  
connect the load whenever the input supply exceeds the  
desired operating range. The LTC4252’s 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. The  
circuit breaker’s response time is accelerated by sensing  
excessive MOSFET drain voltage, keeping the MOSFET  
within its safe operating area (SOA). An adjustable soft-  
start circuit controls MOSFET inrush current at start-up.  
Accelerated Response  
n
±±1 Undervoltage/Overvoltage Threshold Accuracy  
(LTC4252A)  
■
Adjustable Undervoltage/Overvoltage Protection  
■
LTC4252-1/LTC4252A-1: Latch Off After Fault  
■
LTC4252-2/LTC4252A-2: Automatic Retry After Fault  
■
Available in 8-Pin and 10-Pin MSOP Packages  
applicaTions  
n
Hot Board Insertion  
TheLTC4252-1/LTC4252A-1latchoffafteracircuitbreaker  
fault times out. The LTC4252-2/LTC4252A-2 provide au-  
tomatic retry after a fault. The LTC4252A-1/LTC4252A-2  
feature tight 1ꢀ undervoltage/overvoltage threshold  
accuracy. The LTC4252 is available in either an 8-pin  
or 10-pin MSOP, while the LTC4252A is available in the  
10-pin MSOP.  
n
Electronic Circuit Breaker  
n
–48V Distributed Power Systems  
n
Negative Power Supply Control  
n
Central Office Switching  
n
High Availability Servers  
n
ATCA  
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.  
Typical applicaTion  
Start-Up Behavior  
–48V/2.5A Hot Swap Controller  
–48RTN  
R
+
IN  
C
L
3× 1.8k IN SERIES  
1/4W EACH  
100µF  
LOAD  
EN  
GATE  
5V/DIV  
†
C
R3  
1µF 5.1k  
IN  
D
IN  
–48RTN  
(SHORT PIN)  
**  
DDZ13B  
V
R1  
IN  
LTC4252-1  
PWRGD  
SENSE  
2.5A/DIV  
402k  
1%  
V
OUT  
*
OV  
R
1M  
D
UV  
DRAIN  
GATE  
R2  
32.4k  
1%  
Q1  
IRF530S  
TIMER  
SS  
V
OUT  
20V/DIV  
C
T
0.33µF  
SENSE  
V
EE  
R
10Ω  
R
C
S
C1  
10nF  
C
0.02Ω  
SS  
68nF  
C
18nF  
C
PWRGD  
10V/DIV  
425212 TA01  
–48V  
†
* M0C207  
**DIODES, INC  
RECOMMENDED FOR HARSH ENVIRONMENTS  
1ms/DIV  
425212 TA01a  
425212fe  
1
For more information www.linear.com/LTC4252-1  
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