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LT4250H_15 PDF预览

LT4250H_15

更新时间： 2024-11-12 01:16:55
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
14页 242K
描述
Negative 48V Hot Swap Controller

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LT4250H_15 数据手册

 浏览型号LT4250H_15的Datasheet PDF文件第2页浏览型号LT4250H_15的Datasheet PDF文件第3页浏览型号LT4250H_15的Datasheet PDF文件第4页浏览型号LT4250H_15的Datasheet PDF文件第5页浏览型号LT4250H_15的Datasheet PDF文件第6页浏览型号LT4250H_15的Datasheet PDF文件第7页 
LT4250L/LT4250H  
Negative 48V  
Hot Swap Controller  
FEATURES  
DESCRIPTION  
Allows Safe Board Insertion and Removal from a  
TheLT®4250L/LT4250Hare8-pin,negative48VHotSwap™  
controllers that allow a board to be safely inserted and  
removed from a live backplane. Inrush current is limited  
to a programmable value by controlling the gate voltage  
of an external N-channel pass transistor. The pass tran-  
sistor is turned off if the input voltage is less than the  
programmable undervoltage threshold or greater than  
the overvoltage threshold. A programmable current limit  
protects the system against shorts. After a 500μs timeout  
the current limit activates the electronic circuit breaker.  
The PWRGD (LT4250L) or PWRGD (LT4250H) signal can  
be used to directly enable a power module. The LT4250L  
is designed for modules with a low enable input and the  
LT4250H for modules with a high enable input.  
n
Live –48V Backplane  
n
Circuit Breaker Immunity to Voltage Steps and  
Current Spikes  
n
Programmable Inrush and Short-Circuit Current  
Limits  
n
Pin Compatible With LT1640L/LT1640H  
n
Operates from –18V to –80V  
n
Programmable Overvoltage Protection  
n
Programmable Undervoltage Lockout  
n
Power Good Control Output  
n
Bell-Core Compatible ON/OFF Threshold  
APPLICATIONS  
The LT4250L/LT4250H are available in 8-pin PDIP and  
SO packages  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a  
trademark of Linear Technology Corporation.  
n
Central Office Switching  
n
–48V Distributed Power Systems  
n
Negative Power Supply Control  
TYPICAL APPLICATION  
Voltage Step on Input Supply  
–48V RTN  
(SHORT PIN)  
–48V RTN  
R4†  
8
549k  
1%  
V
DD  
3
2
V
AND  
UV =  
EE  
DRAIN  
20V/DIV  
UV  
OV  
R5†  
6.49k  
1%  
38.5V  
1
LT4250L  
PWRGD  
UV  
RELEASE  
AT 43V  
R6†  
10k  
1%  
OV =  
71V  
V
SENSE  
5
GATE  
DRAIN  
7
EE  
I
D
(Q1)  
5A/DIV  
4
6
R3†  
1k, 5%  
*
0.1μF  
10V  
C1†  
470nF  
25V  
R2  
10Ω  
5%  
4250 TA01b  
C2†  
15nF  
100V  
–48V  
INPUT 1  
500μs/DIV  
R1†  
0.02Ω  
5%  
2
Q1  
IRF530  
ON/OFF  
1
9
8
+
–
+
+
–48V  
5V  
V
V
V
IN  
OUT  
SENSE  
INPUT 2  
C3  
0.1μF  
100V  
+
C4  
100μF  
100V  
+
C5  
7
6
5
* DIODES INC. SMAT70A  
TRIM  
100μF  
16V  
† THESE COMPONENTS ARE APPLICATION  
SPECIFIC AND MUST BE SELECTED BASED  
UPON OPERATING CONDITIONS AND DESIRED  
PERFORMANCE. SEE APPLICATIONS  
INFORMATION.  
–
SENSE  
4
–
V
IN  
OUT  
4250 TA01a  
LUCENT  
JW050A1-E  
4250lhfa  
1
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