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LTC4253A PDF预览

LTC4253A

更新时间： 2024-11-07 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
34页 301K
描述
–48V Hot Swap Controllers

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中文翻译

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LTC4253A 数据手册

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LTC4253/LTC4253A  
–48V Hot Swap Controllers  
with Sequencer  
NOT RECOMMENDED FOR NEW DESIGNS  
Please See LTC4253B for Drop-In Replacement  
FEATURES  
DESCRIPTION  
The LTC®4253/LTC4253A negative voltage Hot Swap™  
controllersallowaboardtobesafelyinsertedandremoved  
fromalivebackplane.Outputcurrentiscontrolledbythree  
stages of current-limiting: a timed circuit breaker, active  
current limiting and a fast feedforward path that limits  
peak current under worst-case catastrophic fault condi-  
tions. The LTC4253/LTC4253A latch off after a circuit fault.  
n
Allows Safe Board Insertion and Removal from a  
Live –48V Backplane  
n
Floating Topology Permits Very High Voltage  
Operation  
n
Adjustable Analog Current Limit with Breaker Timer  
Ideal for Two Battery Feeds  
n
Fast Response Time Limits Peak Fault Current  
n
Adjustable Undervoltage/Overvoltage Protection  
Adjustable undervoltage and overvoltage detectors dis-  
connect the load whenever the input supply exceeds the  
desired operating range. The LTC4253/LTC4253A’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 can be accelerated  
by sensing excessive MOSFET drain voltage, keeping the  
MOSFETwithinitssafeoperatingarea(SOA).Anadjustable  
soft-startcircuitcontrolsMOSFETinrushcurrentatstart-up.  
with ±±1 Threshold Accuracy ꢀLTC4253A)  
n
Three Sequenced Power Good Outputs  
n
Adjustable Soft-Start Current Limit  
n
Adjustable Timer with Drain Voltage Accelerated  
Response  
Latchoff After Fault  
Available in a ±6-Pin SSOP Package  
n
n
APPLICATIONS  
n
–48V Distributed Power Systems  
Threepowergoodoutputsaresequencedbyanadjustable  
timer and two ENABLE inputs to enable external power  
modules at start-up or disable them if the circuit breaker  
trips. The LTC4253A features tight ±±1 undervoltage/  
overvoltage threshold accuracy. The LTC4253/LTC4253A  
are available in a ±6-pin SSOP.  
n
Negative Power Supply Control  
n
Central Office Switching  
n
High Availability Servers  
n
Disk Arrays  
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  
–48V/2.5A Hot Swap Controller  
–48V RTN  
Start-Up Behavior  
2.5k  
±5k(±/4W)/6  
+
V
±μF  
IN  
LOAD±  
±00μF  
5.6k  
–48V RTN  
LOAD2  
EN  
5.6k  
5.6k  
GATE  
±0V  
402k  
±1  
EN3  
LTC4253  
EN2  
V
IN  
±0nF  
LOAD3  
EN  
EN  
††  
D
IN  
DDZ±3B*  
RESET  
SS  
±V  
†
†
†
UV  
PWRGD±  
PWRGD2  
PWRGD3  
4253 TA0±  
SENSE  
50mV  
OV  
SS  
32.4k  
±1  
68nF  
DRAIN  
0.±μF  
SQTIMER  
±M  
*DIODES, INC.  
IRF530S  
V
GATE  
OUT  
†
B3±00*  
B3±00*  
MOC207  
0.33μF  
50V  
–48V A  
–48V B  
††  
TIMER  
V
SENSE  
RECOMMENDED FOR HARSH ENVIRONMENTS.  
±0Ω  
EE  
4253 TA0±b  
±ms/DIV  
0.02Ω  
±8nF  
425353afe  
1
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