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LTC4253A-ADJ PDF预览

LTC4253A-ADJ

更新时间： 2024-11-07 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
32页 387K
描述
-48V Hot Swap Controller with Sequencer

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中文翻译

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LTC4253A-ADJ 数据手册

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LTC4253A-ADJ  
–48V Hot Swap Controller  
with Sequencer  
U
FEATURES  
DESCRIPTIO  
■
Allows Safe Board Insertion and Removal from a  
The LTC®4253A-ADJ negative voltage Hot SwapTM con-  
troller allows a board to be safely inserted and removed  
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 LTC4253A-ADJ latches off after a circuit fault.  
Live –48V Backplane  
■
Floating Topology Permits Very High Voltage  
Operation  
■
Adjustable Analog Current Limit with Breaker Timer  
■
Fast Response Time Limits Peak Fault Current  
■
Adjustable Undervoltage/Overvoltage Protection  
with ±1% Threshold Accuracy  
Undervoltage and overvoltage detectors with adjustable  
thresholds and hystereses disconnect the load whenever  
the input supply exceeds the desired operating range. The  
LTC4253A-ADJ’ssupplyinputisshunt-regulated, allowing  
safe operation with very high supply voltages. A multifunc-  
tion timer delays initial start-up and controls the circuit  
breaker’s response time. The circuit breaker’s response  
timecanbeacceleratedbysensingexcessiveMOSFETdrain  
voltage. An adjustable soft-start circuit controls MOSFET  
inrush current at start-up.  
■
Three Sequenced Power Good Outputs  
■
Adjustable Soft-Start Current Limit  
■
Adjustable Timer with Drain Voltage Accelerated  
Response  
Latchoff After Fault  
■
■
Available in 20-Pin SSOP and 20-Pin (4mm × 4mm)  
QFN Packages  
U
APPLICATIO S  
■
–48V Distributed Power Systems  
Three power good outputs can be sequenced to enable  
external power modules at start-up or disable them if the  
circuit breaker trips. The LTC4253A-ADJ is available in  
20-pin SSOP and 20-pin (4mm × 4mm) QFN packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Patent pending.  
■
Negative Power Supply Control  
■
Central Office Switching  
■
High Availability Servers  
■
Disk Arrays  
U
TYPICAL APPLICATIO  
–48V/2.5A Hot Swap Controller  
–48V RTN  
–48V RTN  
2.5k  
15k(1/4W)/6  
Start-Up Behavior  
+
V
IN  
1µF  
LOAD1  
100µF  
5.6k  
255k  
1%  
10nF  
LOAD2  
GATE  
5.6k  
5.6k  
EN3  
10V  
EN2  
LTC4253A-ADJ  
RESET  
V
LOAD3  
IN  
EN  
1.24k  
1%  
EN  
EN  
SS  
1V  
UVL  
UV  
2.1k  
1%  
†
†
†
OVL  
OV  
PWRGD1  
4253A TA01  
0.536k  
1%  
SENSE  
50mV  
PWRGD2  
PWRGD3  
33nF  
SS  
20k  
1%  
DRAIN  
0.1µF  
SQTIMER  
1M  
*DIODES, INC.  
IRF530S  
V
GATE  
†
OUT  
MOC207  
B3100*  
0.68µF  
50V  
–48V A  
–48V B  
TIMER  
SEL  
SENSE  
V
EE  
10Ω  
4253A TA01b  
0.02Ω  
1ms/DIV  
B3100*  
10nF  
4253a-adjf  
1
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中文翻译

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