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LTC4252C-1_15 PDF预览

LTC4252C-1_15

更新时间： 2024-11-08 01:14:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
36页 467K
描述
Negative Voltage Hot Swap Controllers

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LTC4252C-1_15 数据手册

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LTC4252B-1/LTC4252B-2  
LTC4252C-1/LTC4252C-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 (LTC4252C)  
n
Improved Ruggedness Shunt Regulator  
■
Adjustable Undervoltage/Overvoltage Protection  
■
LTC4252B-1/LTC4252C-1: Latch Off After Fault  
■
LTC4252B-2/LTC4252C-2: Automatic Retry After Fault  
■
Available in 8-Pin and 10-Pin MSOP Packages  
APPLICATIONS  
n
Hot Board Insertion  
The LTC4252-2 provides automatic retry after a fault. The  
LTC4252C-1/LTC4252C-2featuretight 1ꢀundervoltage/  
overvoltage threshold accuracy. The LTC4252 is available  
in either an 8-pin or 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  
The LTC4252B and LTC4252C improve the ruggedness  
of the shunt regulator in the LTC4252 and LTC4252A.  
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
+
GATE  
IN  
C
L
3× 1.8k IN SERIES  
5V/DIV  
100µF  
LOAD  
EN  
1/4W EACH  
†
C
R3  
1µF 5.1k  
IN  
D
IN  
–48RTN  
(SHORT PIN)  
**  
DDZ13B  
SENSE  
2.5A/DIV  
V
R1  
IN  
LTC4252B-1  
PWRGD  
402k  
1%  
V
OUT  
*
OV  
R
1M  
D
UV  
DRAIN  
GATE  
V
OUT  
R2  
32.4k  
1%  
Q1  
IRF530S  
20V/DIV  
TIMER  
SS  
C
T
0.33µF  
SENSE  
V
EE  
R
10Ω  
R
C
S
C1  
10nF  
C
0.02Ω  
SS  
68nF  
C
18nF  
PWRGD  
10V/DIV  
C
4252B12 TA01  
1ms/DIV  
4252B12 TA01a  
–48V  
†
* M0C207  
**DIODES, INC  
RECOMMENDED FOR HARSH ENVIRONMENTS  
4252b12f  
1
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