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LTC4252-1CMSPBF PDF预览

LTC4252-1CMSPBF

更新时间： 2024-09-17 03:58:23
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 387K
描述
Negative Voltage Hot Swap Controllers

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中文翻译

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LTC4252-1CMSPBF 数据手册

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LTC4252-1/LTC4252-2  
LTC4252A-1/LTC4252A-2  
Negative Voltage  
Hot Swap Controllers  
U
FEATURES  
DESCRIPTIO  
■
Allows Safe Board Insertion and Removal from a  
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  
limiting and a fast feedforward path that limits peak  
current under worst-case catastrophic fault conditions.  
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  
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.  
■
Programmable Soft-Start Current Limit  
■
Programmable Timer with Drain Voltage  
Accelerated Response  
■
±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  
U
TheLTC4252-1/LTC4252A-1latchoffafteracircuitbreaker  
fault times out. The LTC4252-2 provides automatic retry  
after a fault. The LTC4252A-1/LTC4252A-2 feature tight  
±1% undervoltage/overvoltage threshold accuracy. The  
LTC4252 is available in either an 8-pin or 10-pin MSOP.  
APPLICATIO S  
■
Hot Board Insertion  
■
Electronic Circuit Breaker  
■
–48V Distributed Power Systems  
■
Negative Power Supply Control  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Hot Swap is a trademark of Linear Technology Corporation.  
■
Central Office Switching  
■
High Availability Servers  
■
ATCA  
U
TYPICAL APPLICATIO  
Start-Up Behavior  
–48V/2.5A Hot Swap Controller  
GND  
R
IN  
+
3× 1.8k IN SERIES  
C
L
GATE  
1/4W EACH  
100µF  
LOAD  
EN  
5V/DIV  
C
IN  
1µF  
R3  
GND  
5.1k  
(SHORT PIN)  
V
R1  
402k  
1%  
IN  
LTC4252-1  
PWRGD  
SENSE  
2.5A/DIV  
V
OUT  
*
OV  
R
D
1M  
UV  
DRAIN  
GATE  
R2  
32.4k  
1%  
Q1  
IRF530S  
V
OUT  
TIMER  
SS  
20V/DIV  
C
T
SENSE  
V
EE  
0.33µF  
R
R
S
0.02Ω  
C
C1  
10nF  
C
10Ω  
C
SS  
68nF  
C
18nF  
PWRGD  
10V/DIV  
4252-1/2 TA01  
–48V  
1ms/DIV  
4252-1/2 TA01a  
* M0C207  
425212fb  
1
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中文翻译

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