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LTC4252-1_12 PDF预览

LTC4252-1_12

更新时间： 2024-09-17 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
36页 310K
描述
Negative Voltage Hot Swap Controllers

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中文翻译

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LTC4252-1_12 数据手册

 浏览型号LTC4252-1_12的Datasheet PDF文件第2页浏览型号LTC4252-1_12的Datasheet PDF文件第3页浏览型号LTC4252-1_12的Datasheet PDF文件第4页浏览型号LTC4252-1_12的Datasheet PDF文件第5页浏览型号LTC4252-1_12的Datasheet PDF文件第6页浏览型号LTC4252-1_12的Datasheet PDF文件第7页 
LTC4252-1/LTC4252-2  
LTC4252A-1/LTC4252A-2  
Negative Voltage  
Hot Swap Controllers  
NOT RECOMMENDED FOR NEW DESIGNS  
Please See LTC4252B/LTC4252C for Drop-In Replacement  
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
Programmable Analog Current Limit With Circuit  
Breaker Timer  
n
Fast Response Time Limits Peak Fault Current  
n
Programmable Soft-Start Current Limit  
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.  
n
Programmable Timer with Drain Voltage  
Accelerated Response  
n
±±1 Undervoltage/Overvoltage Threshold Accuracy  
(LTC4252A)  
■
Adjustable Undervoltage/Overvoltage Protection  
■
LTC4252-1/LTC4252A-1: Latch Off After Fault  
■
LTC4252-2: Automatic Retry After Fault  
■
Available in 8-Pin and 10-Pin MSOP Packages  
APPLICATIONS  
TheLTC4252-1/LTC4252A-1latchoffafteracircuitbreaker  
fault times out. The LTC4252-2 provides automatic 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.  
n
Hot Board Insertion  
n
Electronic Circuit Breaker  
n
–48V Distributed Power Systems  
n
Negative Power Supply Control  
n
Central Office Switching  
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
High Availability Servers  
n
ATCA  
TYPICAL APPLICATION  
–48V/2.5A Hot Swap Controller  
–48RTN  
Start-Up Behavior  
R
+
IN  
C
GATE  
L
3× 1.8k IN SERIES  
1/4W EACH  
100μF  
LOAD  
EN  
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  
1ꢀ  
V
OUT  
*
OV  
R
D
1M  
UV  
DRAIN  
GATE  
V
R2  
32.4k  
1ꢀ  
OUT  
Q1  
IRF530S  
TIMER  
SS  
20V/DIV  
C
T
0.33μF  
SENSE  
V
EE  
R
R
C
S
C1  
10nF  
C
10Ω  
C
0.02Ω  
SS  
68nF  
C
18nF  
PWRGD  
10V/DIV  
425212 TA01  
–48V  
1ms/DIV  
425212 TA01a  
†
* M0C207  
**DIODES, INC  
RECOMMENDED FOR HARSH ENVIRONMENTS  
425212fd  
1
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